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Abstract
Nous avons préparé les composes du titre: R 1 3-nP(X)(N = C(R 2 )NH 2 ) n 1 (n = 2, 3; X = O,S) par action des amidines non substitudes R 2- C(˭NH)NH2 sur des oxydes ou sulfures de trichloro ou d'organyldichlorophosphines. Les composés 1, isolés lorsque R2 = Ph, se cyctisent par chauffage en 2-oxo (ou thio)5,2-dihydro-1,3,5,2λ5-triazaphosphinines 2. Les composés 1, instables lorsque R 2 = alkyl, donnent directement 2. Les 2,5 dihydro-1,3,5,2λ3-triazaphosphinines 4 sont obtenus par reaction de P(NMe 2 )3 sur les amidines (rapport 1-2); à partir de ces derniers, nous avons tenté sans succés d'obtenir les composés du phosphore dicoordonné correspondants 7.
The title compounds R 1 3-n P(X)(N = C(R2NH2)n (n = 2,3; C = O,S) are obtained by the reaction of unsubsituted amidines R2 - C(˭NH)‒NH2 with oxo (or thio)tricholoro or organyldichlorphosphines. Isolated compounds 1 (R2 = Ph) lead, with heating, to the 2-oxo (or thio) 2,5-dihydro-1,3,5,2λ5 phosphinines 2. Compounds 1, with R2 = alkyl are unstable, and lead directly to 2. P(NMe2)3 reacts with admines in a molar ratio of 1:2 to give the 2m5-dihydro-1,3,5,2λ3-triazaphosphinines 4; from these latter derivatives we tried unsucessfully to prepare the corresponding dicoordinated phosphorus derivatives 7.