255844-93-0Relevant academic research and scientific papers
Novel isolable C,C-dichlorophosphaalkenes RP=CCl2 owing to the use of new huge stabilizing groups
Rigon,Ranaivonjatovo,Escudie
, p. 153 - 167 (1999)
Three new C,C-dichlorophosphaalkenes RP=CCl2 18-20 have been synthesized from the corresponding dichlorophosphines RPCl2 11-13. Compounds 18-20 are stabilized owing to the use of the very bulky new groups R1 [2,6-bis(4-methylphenyl)-4-methylphenyl] and R3 [2,6-bis(2-methoxyphenyl)-4-methylphenyl] and the known 2,6-dimesityl-4-methylphenyl (R2). The compounds with a R3 group (R3I: 4, R3PCl2: 13, R3PH2: 17 and R3P=CCl2: 20) exist in the form of two conformational isomers on the NMR time scale. A 1H and 31P NMR dynamic study (for 4 and 13 respectively) allowed the determination of the ΔG* of this phenomenon, respectively 18.5 and 18.2 kcal/mol.
