close

Вход

Забыли?

вход по аккаунту

?

Intramolecular Coupling of Diazotized N-(2-Aminophenyl)pyrrole to form Pyrrolo[1 2-c][1 2 4]benzotriazine.

код для вставкиСкачать
H2S + 4 FZ+ SF6 + 2 HF). Sulfur oxyfluorides are then present
only in traces. SF6is completely pure after a single washing with
10 % caustic potash. On electrofluorination of N20, products
are formed which explode after condensing in liquid air.
Most of the fluorination products mentioned are known, but
hitherto they could only be prepared by using elementary
fluorine.
Received, February 7th, 1963
[Z 469/300 IE]
Publication withheld until now at the author's request
[I] U.S. Pat. 2519983 (Aug. 22nd, 1950), Minnesota Mining &
Manufacturing Co.; inventor: J. H . Simons; U.S. Pat. 2806817
(Sept. 17th, 1957), General Electric Co.; inventor: J. K. Wove.
[2] J. C . Tatlow, M . Stacey, and A . G . Sharpe: Advances in
Fluorine Chemistry. Butterworth Scientific Publications, London 1960, Vol. 1, p. 129 et seq.; Houben-Weyl: Methoden der
organischen Chemie. Georg Thieme Verlag, Stuttgart 1962, Vol.
V/3, pp. 38-42.
Silicon Tetrakisdiethylphosphide
By Prof. Dr. G. Fritz [I] and Dr. G. Poppenburg
lnstitut fur Anorganische Chemie
der Universitat Munster (Germany)
In continuation of our investigations on derivatives of
H3SiPH2 [2], we have prepared Si[P(CzH&]4 ( I ) , b.p. ca.
16OoC/1 mm, by treating Sic14 with LiP(C2H5)z in a ratio of
1 :4. In addition to ( I ) , considerable quantities of [(C2H&P]z
are formed. Compound ( I ) is decomposed by alkali as
follows:
+
Si[P(CzHs)zl.~ 4 HzO
NaOH
__z
{Si(OHh}
+ 4 (CzHs)zPH
The reaction proceeds quantitatively o n warming. The
HP(CzH5)z (2) formed is transformed by HgClz solution
into the sparingly soluble compound (C2H5)zPHgCl. This
can be used to estimate (2) quantiratively by subsequent
iodometric titration. Compound ( I ) ignites in air and is
extremely sensitive t o moisture.
Received, February loth, 1963 [Z 456/287 IE]
[l] New adress :Institut fur Anorganische und Analytische Chemie
der Universitat GieDen (Germany).
[2] G. Fritz, Z. anorg. allg. Chem. 280, 332 (1955); G. Fritz and
G. Poppenburg, Angew. Chem. 72,208 (1960); G. Fritz, G. Poppenburg, and M . G. Rocholl, Naturwissenschaften 49, 255 (1962); G.
Fritz and G. Poppenburg, ibid. 49, 449 (1962).
Explosion during the Destruction of Dimethyl
Sulfate with Ammonia
By Dr. H. Lindlar
Chemische Forschungsabteilung,
F. Hoffmann-La Roche & Co. A.G., Base1 (Switzerland)
Excess dimethyl sulfate left over after methylations must be
destroyed because of its poisonous nature. Ammonia is
widely recommended for this purpose in the literature.
Through an experimental error about 1.5 1 of dimethyl sulfate
were brought into contact with 1-2 1 of concentrated aqueous
ammonia. After about 10 seconds, a n extremely violent
reaction occurred which shattered the flask. The fragments
injured a workman, and several windows were broken.
Fortunately, the accident occurred in the open and caused
no extensive damage; no symptoms of poisoning through
inhalation of dimethyl sulfate were observed.
Experiments with smaller quantities showed that pure dimethyl sulfate and concentrated aqueous ammonia react
extremely violently with one another [l].
When destroying dimethyl sulfate with ammonia, the latter
should therefore only be added diluted and in small quanReceived, February 12th, 1963 [ Z 447/277 IEI
tities.
[l] Cf. P. Claesson and C. F. Lundvall, Ber. dtsch. chem. Ges. 13,
1700 (1880).
262
Application of the Becquerel Effect to the
Investigation of Photochemical Reactions
By Dr. H . Mauscr and Dipl.-Chem. U. Sproesser
Institut fur Physikalische Chemie
der Universitit Tubingen (Germany)
We are investigating the Becquerel effect displayed by dissolved organic substances [I]. If two identical electrodes are
introduced into a solution of a suitable organic compound
and one electrode is illuminated, a potential difference, which
becomes stable after a few minutes, is established between
them. The potential difference disappears again after a time
if the light source is switched off.
Over 100 systems were examined; aromatic and aliphatic 0x0
and dioxo compounds, aromatic nitro compounds, aliphatic
halogeno compounds, and nitrous esters, as well as polymerizable unsaturated compounds in polar solvents such as
alcohols, dimethyl sulfoxide, or tetramethylene sulfone. The
photochemical potentials and currents were measured as
functions of time in relation to wave length and intensity [21.
A correlation between ability to fluoresce and Becquerel
activity, as reported in the older literature, could not be
established. Only those systems show this effect which react
photochemically under our experimental conditions and
which undergo reactions where radical mechanisms are
either established or probable. Systems in which cis ->
trans rearrangement or isomerization takes place are, as far
as has been investigated, inactive.
The results of our measurements lead to the conclusion that
r a d i c a l s occur as intermediates and exchange electrons
with the illuminated electrode, which thus accumulates a
charge. All our potential vs. time curves can be reduced to a
few types. Parallels between curves and type of reaction are
indicated. The growth and decay curves can frequently be
interpreted as being formed by superposition of two simple
curves with equal or opposite sign. The conclusion that can
be drawn from this is that different radical intermediates
occur. As expected, the purity of the materials used as well
as the presence of oxygen and other radical acceptors influence the shapes of the curves.
As our work stands at present, the Becquerel effect can be
used to detect photochemical reactions involving radical
mechanisms and to determine the effective spectral ranges
for them, in particular their limits in the long-wave region.
In favorable circumstances, it is possible to identify the
mechanisms by their different spectral regions.
Received, February 25th, 1963 [Z 455/285 IE]
[ I ] E. Becquerel, C. R. hebd. Seances Acad. Sci. 9 , 145 (1839).
Most recent review: A . W. Copeland, 0 . D . Black, and A. B. Garrett, Chem. Reviews 31, 177 (1942).
[2] For experimental details, see U. Sproesser, Diploma thesis,
Universitat Tubingen, 1962.
Intramolecular Coupling of Diazotized
N-(2-Aminophenyl)pyrrole to form
Pyrrolo[1,2-c][1,2,4]benzotriazine
By Dr. H. Gross and Dip].-Chem. J. Gloede
Iiistitut fur organische Chemie der Deutschen Akademie der
Wissenschaften zu Berlin, Berlin-Adlershof (Germany)
On diazotizing N-(2-aminophenyl)pyrrole ( I ) [l] in aqueous
acidic medium, we immediately obtained not the expected
diazonium salt (2) but a yellow, crystalline compound of
m.p. 243-244 "C in over 90 '%,yield. Analysis and molecularweight determination indicate that this compound has the
formula C10H7N3.
The assumption that the hitherto unknown compound
pyrrolo[l,2-c] [1,2,4]benzotriazine ( 3 ) is formed from (2) in
Angew. Chem. internal. Edit. Vol. 2 (1963) 1 No.5
an intramolecular coupling reaction was confirmed by
oxidative degradation: on boiling ( 3 ) with aqueous potassium permanganate, 1,2,4-triazine-3,5,6-tricarboxylicacid
silylamines is normally situated a 1 1 180 cm-1 but appears in a
distinctly weakened form in the ring of ( I ) . It is thus comparable to the SNH-band in the planar (-R2Si-NH-)3
ring
(1159 cm-1).
Received, Mal-ch Ist, 1963
[I] Communication No. 29 on SiN-compounds. Communication
No. 22: Angew. Chem. internat. Edit. 2,46 (1963); Comm. Nos.
23 and 24: Chem. Ber.; Nos. 25 28: Z . anorg. allg. Chem. (in
the press).
[2] H . Ernsr, Ph. D. thesis, Technische Hochschule Aachen, 1958.
[3] W. Fink, Angew. Chem. 73, 736 (1961).
[4] S. D.Brewer and C . P. Haber, J . Amer. chem. SOC.70, 3888
(1948).
[5] U.Wannagat and H . Niederprum, Angew. Chem. 70, 745
(1958); Z . anorg. allg. Chem. 311, 270 (1961).
[6] M . V . George, D . Wittenberg, and H . Gilman, J. Amer. chem.
SOC.81, 361 (1959).
COOI-I
\
I
0-co
(5)
141
( 4 ) was obtained, and from it 1,2,4-triazine-5,6-dicarboxylic
anhydride ( 5 ) m.p. 175-183 "C ([2] gives 176-184°C).
Received, February 27th, 1963
[Z 4571293 IEI
[ l ] H . Gross, Chem. Ber. 95, 2270 (1962).
[2] R. Rutz and H. Schroeder, J. org. Chemistry 23, 1531 (1958).
Tetrasilapiperazine - a New SiN Ring System [l]
By Prof. Dr. U. Wannagat and Dip].-Ing. 0. Brandstatter
lnstitut fur Anorganische Chemie
der Technischen Hochschule Graz (Austria)
Four-, six-, and eight-membered silicon-nitrogen rings with
alternating Si-N units have been known for quite a long
time [2-41. After the preparation of a n Si2N4 ring in
(-R2Si-NH-NH-)2
and its derivatives [5,6], we have now
also found an Si4N2 ring ("tetrasilapiperazine") in 2,3,5,6octamethyl-1,4-diaza-2,3,5,6-tetrasilacyclohexane
( I ) , m.p.
f l OC, b.p. 61 OC/2 mm, n$ = 1.4760, d y = 0.8458, a compound we obtained by treating 1,2-dichlorotetramethyldisilane with gaseous ammonia in a solution of petroleum
ether (R=CH3 throughout) :
2 CIR2Si -SiRZCI
+ 6 NH3 + 4 NH&I + ( -RzSi
-SiR2 -NH
(1)
(5)
1
Rzki
/
M
'
SIR2
R R
R-Si-Si-N
R R
Organisch-chemisches Institut der Technischen Hochschule
Munchen (Germany)
We have shown [l] that l-amiiio-2-butene-4-ol derivatives
can be prepared stereospecifically by way of diene synthesis
with -N=O dienophiles. In the products, the NH2- and the
OH-groups are erythro to one another, and the substituents
on the carbon-carbon double bond are in cis-relationship.
Starting from such compounds, polyhydroxyamino compounds of known stereochemistry can be obtained; these are
of interest, for example, as amiiiosugar or inosamine derivatives (see e.g. [2]). Here we have investigated the following
possibilities:
1. Cyclohexadiene derivatives give inosamine derivatives.
We have prepared compounds ( I ) through (4a) as models.
Nitrosobenzene + cyclohexadienc + 3-phenyl-[2-oxa-3-azabicyclo[2,2,2]-5-octene (m.p. 65 66 " C ) + cis-I-(N-acetylanilino)-4-acetoxy-2-cyc1ohexene(m.p. 56-57 "C) + I-(Nacetylani1ino)-2-trans- 3 -trans-dihydroxy-4-cis-acetoxycyclohexane (3) (tetraacetyl derivative of (3) has m.p. 130-131 OC;
the stereochemistry is based on the acetanilido group) + a
dideoxyinosamine, l-aminocyclol~exane-2-tvans-3-trans-4-cistrio1 ( 4 ) ; the tetraacetate (4a) has m.p. 93-95 "C.
A c--N-C:6115
1, x n
=!I
~~~l!,cooll
i(Yn20
&If.5)
SIR3
'SiRz
By Prof. Dr. G. Kresze, Dr. G. Schulz, and Dipl.-Ing. F. Fir1
N--c'611s
methylsilylamino)tetrachlorodisilane.
w
__
N
Polyhydroxyamines via Diene Syntheses with
Nitroso Compounds
-)2
Ammonolysis of pentamethylchlorodisilane (2) leads smoothly to bis(pentamethy1disilanyl)amine (R3SiSiRz)zNH (3), b.p.
102-103 "C/13 mm, n g = 1.4609, d'," = 0.8154. Compound
( 3 ) can be transformed by NaNH2 in benzene with evolution
of NH3 into the N-metallated derivative NaN(SiZR&, m. p.
58-62 "C, which is highly sensitive t o moisture and air. Compound ( 2 ) , on the other hand, reacts only sluggishly and nonuniformly with sodium bis(trimethylsily1)amide ( 4 ) . We
managed to isolate almost pure (>90 %) N-pentamethyldisilanyl-N,N-bis(trimethylsily1)aniine ( 5 ) , (b. p. 90-93 "C/
14 mm, m.p. < -7O"C, nE = 1.442, d'," = 0.822) from the
reaction products. Analogous reaction of ( 4 ) with hexachlorodisilane, too, has so far only proceeded to the stage of
an N-pentachlorodisilanyl-N,N-bis(trimethylsilyl)amine,b. p.
78-8O0C/lmm, which also contained 20 "/o 1,2-di(bis-tri-
R2Si'
A c,
I Cdk
H12N-
'SiR,
Angew. Chem. internat. Edit. Vol. 2 (1963)
/ No. 5
..<
I
I
I
H
c6k15
I I-C-OIi
HO
O.$C
(6)
c H,OH
Il~.c
&,I,
%
'The infrared spectra of ( I ) and ( 3 ) display characteristic,
very strong bands of vas SiNSi at 925 and 920 cm-1, and
also of BNH at 1141 and 1172 cm-1. The NH-band in bis-
3
ouc
/
&.
H
[Z 458/288 IE]
Cl1201i
=
k1
(Ra) R = COCH,
(71
263
Документ
Категория
Без категории
Просмотров
0
Размер файла
241 Кб
Теги
pyrrol, forma, aminophenyl, intramolecular, diazotized, benzotriazine, couplings, pyrroles
1/--страниц
Пожаловаться на содержимое документа