Synthesis and Isolation of cis‐ and trans‐1,3,2λ³, 4λ³‐Diazadiphosphetidine

Synthesis and structural study of 2,4-disubstituted 1,3-diaryl-1,3,2,4-diazadiphosphetidines

“…610 (w), 535 (m), 450 (w) cm"1. MS (parent and five most intense envelopes): m/e (relative intensity) 580 (9), 412 (100), 290 (19), 198 (27), 169 (12), 122 (62). 6 is very soluble in CHC13, moderately soluble in CH2C12, and slightly soluble in C6H6 and C6H5CH3.…”

“…ß, deg 103. 12 (3) v, A3 1431 (1) 1751 (1) tarns-[(C6H5N)PNH(/-C3H7)]2 (12). C3H7NH2 (8.1 mmol) and (C2H5)3N (8.1 mmol) were added dropwise at 24 °C to a stirred toluene solution of 5 (4.06 mmol).…”

“…Thus we conclude that for 5, like its N(ring)-alkyl analogue [(i-C4H9N)PCl]2, the cis isomer is the thermodynamically stable form. Compound 5 reacts with (C6FI5)2NH, (h-C4H9)2NH, i-C3H7NH2, or (C2H5)2NH, in the presence of (C2H5)3N (eq 6) (6) R, R' = C6Hj, C6Hj (6); n-C4H9, n-C4H9 (10); H, f-C3H7 (12); C2H5, C2H5 (11) to form the new 2,4-diamino-1,3-diphenyl-1,3,2,4-diazadiphosphetidines [(C6H5N)PN(C6H5)2]2 ( 6), [(C6H5N)PN(«-C4H9)2]2 (10), and [(C6H5N)P(f-C3H7NH)]2 (12) and the previously re- periments. Also, these data further substantiate the general correlation5 that in both the N(ring)-alkyl-and N(ring)-aryldiazadiphosphetidines the "low" and "high" field 31P NMR resonances correlate with trans and cis isomers, respectively.…”

“…(i) The iV(ring)-aryldiazadiphosphetidines prefer trans isomers when both exo-amino groups are relatively bulky (e.g. 6, [10][11][12][13][14][15][16]. With smaller substituents the cis form becomes more stable (e.g.…”

Novel ditopic receptors based on the P2N2 diphosphazane ring: synthesis and x-ray structural characterization of cis and trans bis(crown ether) annelated 1,3,2.lambda.5,4.lambda.5-diazadiphosphetidine 2,4-disulfide

“…This would be indicative of a single process for the oxidation of phosphorus by elemental sulfur. 26 In addition to 1 and 4, the 3IP NMR spectra showed that during the sulfurization step, two 1:1 signals ( (31 ) 92.0 and 51.4, toluene, 50 °C) appeared and were attributed to an intermediate P(S)PlnN2 species with a JPP value of 0 Hz. It slowly disappeared within a few hours to give 1. A minor product ( (31 ) 47.9 and 39.9, JPP = 19.1 Hz, toluene, 70 °C) was also detected and could be probably a higher condensation product containing an asymmetric diphosphazane structure.…”