The crystal and molecular structures of six- and seven-membered-ring organophosphorus compounds. 1,3,2-Dioxaphosphorinanes and 1,5-dihydro-1,4,3-benzodioxaphosphepins

3-(2-Chlorophenoxy)-1,5-dihydroxy-2,4,3-benzodioxaphosphepine 3-oxide

“…In the dioxaphosphepine ring system of (I), the corresponding bond lengths and angles (Table 1) of the two P-O-CH 2 -C fragments are equal within experimental error. The endocyclic O-P-O and P-O-C bond angles [108.4 (4) and 123.2 (2) ] are in good agreement with the values of the corresponding seven-membered-ring structures [Selladurai & Subramanian, 1991;Sivakumar et al, 1989;Grand & Robert, 1978]. As a result of the presence of the C10 C11 double bond, considerable differences in the C-O and P-O distances are observed in the dioxaphosphepine ring.…”

6-Chloro-2-(4-chlorophenoxy)-2-thioxo-4-trichloromethyl-4H-1,3,2-benzodioxaphosphorine

“…Bond lengths and angles of the dioxaphosphorine ring are comparable to those observed in similar compounds (Ś lepokura & Lis, 2004;Hommer et al, 1998;Miller et al, 1981;Grand & Robert, 1978). The S atom at P2 is equatorial, whereas the trichloromethyl group at C4 is in an axial position.…”

6-(4-Chlorophenoxy)dibenzo[d,f][1,3,2]dioxaphosphepin 6-sulfide

“…The bond angle O(2)-P-O(3) [103.9 (1)°1 is normal for six-and seven-membered-ring organophosphorus compounds (Grand & Robert, 1978). The P=S bond length, 1.894 (2)A, is shorter than expected 11.93 A: Wieczorek, Sheldrick, Karolak-Wojciechowska, Mikolajczyk & Ziemnicka (1979)].…”