87437-16-9Relevant academic research and scientific papers
SYNTHESIS AND PHOTOREACTIONS OF E-1-(2,4,6-TRIISOPROPYLPHENYL)-2-(2,4,6-TRI-TERT-BUTYLPHENYL)DIPHOSPHENE
Komen, Corine M. D.,Goede, Simon J.,Bickelhaupt, Friedrich
, p. 251 (2007/10/02)
The synthesis and irradiation of the title compound E-1 are discussed.
Synthesis, Photochemical Behaviour and cis/trans Isomerisation of 1-(2,4,6-Triisopropylphenyl)-2-(2,4,6-tri-tert-butylphenyl)diphosphene
Komen, Corine M. D.,Kanter, Frans J. J. de,Goede, Simon J.,Bickelhaupt, Friedrich
, p. 807 - 812 (2007/10/02)
Irradiation of (E)-1-(3,4,6-triisopropylphenyl)-2-(2,4,6-tri-tert-butylphenyl)diphosphene (1a) yields its thermally unstable cis-isomer 1b, the diastereoisomeric cyclisation products 4a and 4b and the cleavage product 5.A mechanism for the formation of these products is proposed.The activation parameters for the thermal isomerisation reaction 1b -> 1a are experimentally determined as ΔH(excit.)=29.5 +/-1.4 kcal mol-1 and ΔS(excit.)=38 +/- 6 cal mol-1 K-1 (1 kcal=4.18 kJ); ΔH(excit.) is the first experimentally determined measure for the strength of the ?-component of a phosphorus-phosphorus double bond.
STABLE UNSYMMETRICAL DIPHOSPHENES
Smit, C.N.,van der Knaap, Th.A.,Bickelhaupt, F.
, p. 2031 - 2034 (2007/10/02)
Variation of the ortho-alkyl substituents in diaryldiphosphenes revealed that their stability is determined by steric hindrance.By suitable combinations of ortho-substituents, it was therefore possible to prepare the first relatively stable unsymmetrical
