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4438
The procedure consisted of cyclizing bis-(2-cyanoethyl)-phosphines (11) to the corresponding 4amino - 1,2,5,6 - tetrahydrophosphorin - 3 - carboni triles (111) using sodium t - b ~ t o x i d efollowed ,~ by hydrolysis and decarboxylation to the 4-phosphorinanones in refluxing 6 N hydrochloric acid. We also prepared an arsenic carbonitrile (IV) using the same condensing agent. (NCCH2CHs)ZPR
&m
\R IIa, R = C,H, b, R = C,,H;
IIIa, 12 = C1H5 b, R = C,H,
6 R
Ia, R = C,H, b, R = C6Hj
3,3'-(Phenylarsylene)-dipropionitrileY gave 4 amino-1,2,5,6-tetrahydro1 - phenylarsenin - 3 - carbonitrile (IVb); m.p. 65-67". Calcd. for C12HljN2As: C,55.40; H,5.04; N, 10.77; As,28.20; mol. wt., 260. Found: C, 55.40; H , 5.04; N, 10.58; ils, 28.70: mol. wt., 277. Infrared bands a t 3480, 3380, 2180, 1643 and 1605 cm.-'. (9) I
