The stereochemistry of the phosphorus–selenium bond. VI. Structure of 5,5-dimethyl-2-methylseleno-1,3,2-dioxaphosphorinane 2-selenide

Reactivities of Secondary Phosphine Selenides Cp(CO)2FeP(Se)(OR)2: Formation of a Diiodine Charge Transfer Adduct and Se-Methylation

“…On the other hand, the solid-state structure of 2b (Figure ) exhibits a shorter Fe−P distance (2.178(2) Å) and a longer P−Se length (2.232(2) Å) compared to those observed in 1b . The Se−C length (1.975(11) Å) is comparable to those reported in Me 2 C(CH 2 O) 2 P(Se)SeCH 3 (1.951(4) Å) . The angles around P are in the range 93.7(3)−118.9(3)°, with the O−P−O angle being the smallest.…”

“…The Se-C length (1.975(11) A ˚) is comparable to those reported in Me 2 C(CH 2 O) 2 P(Se)SeCH 3 (1.951(4) A ˚). 14 The angles around P are in the range 93.7(3)-118.9(3)°, with the O-P-O angle being the smallest.…”

5,5-Dimethyl-2-methylseleno-1,3,2-dioxaphosphorinan-2-one

“…Conformers with axial Se atoms were found also for -NHEt derivative (Bartczak et al, 1986), and for two compounds with double P=O or P=S bonds: the bisselenide and the bisdiselenide, respectively (Wieczorek et al, 1995 andPotrzebowski et al, 1994). In the case of 5,5-dimethyl-2-methylseleno-1,3,2-dioxaphosphorinane-2-selenide the group -SeMe is aligned in the axial position and P=Se positioned equatorially (Bartczak et al, 1987). In 5,5-dimethyl-2-methoxy-2-seleno-1,3,2-dioxaphosphorinane -OMe is axial, so Se atom adopts the equatorial position (Grand et al, 1975).…”

“…For the structures of similar methyl esters with >P(Se)OMe and >P(Se)SeMe groups, see: Grand et al (1975); Bartczak et al (1987). For 5,5-dimethyl-2-seleno-1,3,2-dioxaphosphorinane derivatives with equatorial Se atoms, see: ; ; Wolf & Bartczak (1989) and for O-acyl derivatives with equatorial selenium, see: Cholewinski et al (2009).…”

“…The title compound, 5,5-dimethyl-2-methylseleno-2-oxo-1,3,2-dioxaphosphorinane, forms molecular crystals (Fig. 1) (Bartczak et al, 1987) the relevant angle is ca two degrees wider (95.17°). Rather long P-Se bond length of ca 2.2 Å is typical for selenium with the coordination number two.…”