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Dimeric 1 3 4 2-Oxadiaza-PV-phospholes Ten-Membered Tricyclic Compounds Containing Pentacoordinated Phosphorus as a Bridgehead Atom.

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vmax(KBr) 3240, 3070, 1658, 1555, 1465, 1323, 1270, 1206,
872, 859, and 800cm-1; U V Amax(EtOH)232nm (log e =
4.23), 285 (3.62), 301 (3.69). 338 (3.99,and 414 (3.90). The
intermediates of this reaction should be 1.4-dihydroxy-8cyanoheptafulvenes, (3u) and ( 3 b ) , which probably isomerize
to each other through the tropone structures, (3c) or ( 3 d ) .
particularly under basic conditions. The compound ( 4 ) can
be formed by intramolecular cyclization of ( 3 ~ ) .
Received: June 9, 1969
[Z 41 IE]
German version: Angew. Chem. 81, 702 (1969)
[*] Dipl.-Chem. M. Oda and Prof. Dr. Y . Kitahara
Department of Chemistry, Faculty of Science
Tohoku University, Sendai 980 (Japan)
[l] M . Udu and Y. Kifuharu, Chem. Commun., in press.
[2] Cf. G. Dufruisse, G . Rio, and W. A . Burris. C.R. hebd. Seances
Acad. Sci. 244, 2674 (1957).
131 Structure evidence: The IR and UV spectra are comparable
with those of 3-cyano-1-oxaazulane-2-imine
[4] T . Nozoe, T . Mukai, and T. Suzuki, Bull. chem. Soc. Japan
36, 38 (1963).
Dimeric 1,3,4,2-Oxadiaza-Pv-phospholes,
Ten-Membered Tricyclic Compounds Containing
Pentacoordinated Phosphorus as a Bridgehead
By J. Ebeling and A . Schmidpeter [*I
Acetohydrazide reacts with trichlorophosphoranes to eliminate 3 mol. equiv. of HCl. The reaction products (see Table),
having the composition C ~ H ~ N Z O P X
Z ,colorless crystals,
readily soluble even in nonpolar solvents, and sublimable in
vacuum. They are thermally stable and resistant to oxidation,
such behavior ruling out their formulation as acetylphosphinodiimines but being in accord with cyclic phosphazenes isomeric to them; moreover, their molecular weights
are found by osmometry and mass spectrometry to correspond to twice that of the empirical formula. Of the various
structural isomers consistent with the above data, the nuclear
magnetic resonance spectra provide unequivocal evidence in
favor of formula (I) [21: The large positive 3*P shift can be
attributed only to pentacoordinated phosphorus, and the
multiplet structure of the IH-NMR signal when X = CH3
and N(CH3)z can only be due to a H,PP'H, spin system
with proximate phosphorus atoms.
Compounds ( I ) should be regarded as products of phosphazene dimerization. Although dimerization of a phosphazene to the 1,3,2,4-diazadiphosphetidine ring is known in
principle, the reaction has hitherto been limited to iminotrihalogenophosphoranes with strongly basic imino nitrogen
carrying a not too bulky substituent 131; phosphazines are
known only as monomers. The dimerization of an oxadiazaPv-phosphole is therefore unexpected, at least when
X = CH3 and N(CHJ)p, and would appear to beconnected
with the phosphorus becoming member of a small ring. For
an oxadiazaphosphole an OPN angle of about 90 is required,
which can be readily realized only with pentacoordinated
phosphorus(v). Cyclophosphazenes having six or more
members in the ring show no tendency to associate.
To satisfy the angle requirements, a phosphorus atom in (1)
must participate in both the four-membered and the fivemembered ring, with one axial and one equatorial bond of
the trigonal bipyramid; the five-membered rings can be fused
onto the longer (axial) or the shorter (equatorial) sides of the
diazadiphosphetidine rectangle. If the two external rings are
assumed to be in trans position, then two structures are
possible for ( I ) , that with the electronegative oxygen in the
axial position being the most likely[41; it is confirmed for
( l b ) and (Ic) by the equivalence of the methyl protons in the
IH-NMR spectrum.
2,2,7,7-Tetruchloro-4,9-dimethyl3.8-dioxa- I.S,6,10- tetraaza2,7-diphospha-P~-tricyclo~,9-diene
(dimeric 2dichloro-5-methyl-I,3,4,2-oxadiaza-P~-phospole)
An intimate equimolar mixture of PQ5 and acetohydrazide
reacts exothermally with liberation of HCI and formation of
a melt. Compound ( l a ) sublimes from the crude, glassy reaction product at 120°C/0.1 torr in the form of needleshaped crystals (yield 52%).
( I b ) and ( I c )
Trichlorophosphorane (0.1 mole) is added with stirring at
0 "C to a solution of acetohydrazide (0.1 mole) and triethylamine (0.3 mole) in benzene (120 ml). After the reaction mixture has been kept at 0 OC for 3 h and at 20 "C for 15 h, the
triethylammonium chloride is filtered off and the filtrate is
evaporated to dryness. ( I b ) can be sublimed at 13OoC/0.1
torr, and ( I c ) can be recrystallized from pentane (yield 80%).
Received: June 26, 1969
[Z 44 IEI
German version: Angew. Chem. 81, 707 (1969)
I*] Dr. 3. Ebeling and Priv.-Doz. Dr. A. Schmidpeter
Institut fur Anorganische Chemie der Universitat
8 Munchen 2, Meiserstrasse 1 (Germany)
[l] Part 34 of Phosphazenes.
-2.12 [c] -1.77
-1.68 [dl -2.55 [d]
[a] Molecular ion in the mass spectrum; recorded by
Dr. H . Seidl.
- Part 33: A . Schmidpeter and C.
Weingand, Angew. Chem. 81,573(1969); Angew. Chem. internat.
Edit. 8, 615 (1969).
[2] A similar tricyclic system has recently been reported by
M . Becke-Goehring and M . R . WOE Naturwissenschaften S5,
543 (1968).
[3] V . Gutmunn, K . Utvury, and M . Bermann, Mh. Chem. 6 ,
1745 (1966).
141 R. J. Gillespie, Angew. Chem. 79, 885 (1967); Angew. Chem.
internat. Edit. 6, 819 (1967).
Bis(dimethylamido)bis(N-fluorosulfonylimido)sulfur, a Covalent Compound Containing the
SN4 Grouprll
[bl Solution in CC14 with TMS as internal standard.
[cl Pseudotriplet; JPOCCH
is given as coupling constant.
[dl Multiplet; JPCH
is given as coupling constant for ( l b ) , and
J~NCH J ~ N ~ N C
is H
given for (Id.
[el Solution in CC14 with 85 % H3P04 as external standard.
By H. W. Roesky and D . P. Babb[*]
During investigations on fluorosulfonyl compounds we succeeded in preparing for the first time a covalent sulfur-nitrogen compound whose sulfur atom is surrounded by four
nitrogen atoms.
Angew. Chem. internat. Edit. 1 Vol. 8 (1969)1 No. 9
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containing, compounds, bridgehead, atom, membered, ten, dimeric, phosphole, pentacoordinate, tricyclic, oxadiaza, phosphorus
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