Synthesis of the first fluoro(phosphanyl)- and diphosphanyl-stannanes and surprising formation of [P(SnMe3)4]+ SiF5-.
Monophosphanylation of the difluorostannane Is2SnF2 (Is = 2,4,6-triisopropylphenyl) with Si(PH2)4 furnishes the first isolable fluoro(phosphanyl)stannane Is2Sn(F)PH2 1, which readily undergoes unique SiO2-assisted decompostion to [Is2Sn(PH)]2 2 and HF, while further phosphanylation of 1 leads to the remarkably stable diphosphanylstannane Is2Sn(PH2)2 3; the latter reacts with Me3SnF at the glass-wall to give the first perstannylphosphonium pentafluorosilicate [P(SnMe3)4]+ SiF5- 4.
Ein neues PH-funktionelles Diphosphadistannetan : (tBu2SnPH)2
A Novel PH-Functional Diphosphadistannetane: (tBu2SnPH)2 
 
 
 
The reaction of tBu2SnCl2 with NaPH2 in liquid ammonia yields the four-membered ring compound (tBu2SnPH)2 (1). The corresponding silyl compound, (tBu2SnPSiMe3)2 (2), is obtained by metallation of 1 with tBuLi and metathesis with Me3SiCL Both compounds are characterized by NMR analysis (1H, 31P, 119Sn) and 1 by an X-ray structure analysis; it reveals a planar heterocycle.
IR‐Spektren und Struktur von α‐β‐ungesättigten Carbonylverbindungen, XXI. Thione aus der Reaktion von Alkylaminocrotonestern mit Phosphorpentasulfid
Bei der Einwirkung von P4S10 auf Alkylaminocrotonester 1 entstehen Thiaphosphetane 2, die sich spontan in Oxaphosphetane 3 umlagern. Die ersteren enthalten das Enaminocarbonyl- die letzteren das Enaminothion-System. Die Kopplungen der Gerustvalenz-und der NH-Deformationsschwingungen in den beiden Reihen wurden diskutiert. Die intramolekulare Wasserstoffbruckenbindung ist in der Thionreihe starker als in der Carbonylreihe. 
 
 
 
I. R. Spectra and Structure of α, s-Unsaturated Carbonyl Compounds, XXI. Thiones from Reactions of Alkylaminocrotonates with Phosphorus Pentasulfide 
 
 
 
Alkylaminocrotonates 1 react with P4S10 to yield thiaphosphetanes 2 which rearrange spontaneously to oxaphosphetanes 3; the former are enamino-carbonyl derivatives while the latter contain an enamino-thione system. Couplings between the valence and NHJ-bending vibrations in both series are discussed. The intramolecular hydrogen bonding has been shown to be considerably stronger in the thiones than in the carbonyl compounds.