Crystal Structures of [Bu 2 Sn(O 2 PPh 2 ) 2 ], [Ph 2 Sn(O 2 PPh 2 ) 2 ], and [PhClSn(O 2 PPh 2 )OMe] 2 . Raman Spectra of [Ph 2 Sn(O 2 PPh 2 ) 2 ] and [PhClSn(O 2 PPh 2 )OMe] 2

[(n‐Bu) 2 Sn(O 2 PPh 2 ) 2 ] ( 1 ), and [Ph 2 Sn(O 2 PPh 2 ) 2 ] ( 2 ) have been synthesized by the reactions of R 2 SnCl 2 (R=n‐Bu, Ph) with HO 2 PPh 2 in Methanol. From the reaction of Ph 2 SnCl 2 with diphenylphosphinic acid a third product [PhClSn(O 2 PPh 2 )OMe] 2 ( 3 ) could be isolated. X‐ray diffraction studies show 1 to crystallize in the monoclinic space group P2 1 /c with a = 1303.7(1) pm, b = 2286.9(2) pm, c = 1063.1(1) pm, β = 94.383(6)°, and Z = 4. 2 crystallizes triclinic in the space group ${\rm P}{\bar 1}$ , the cell parameters being a = 1293.2(2) pm, b = 1478.5(4) pm, c = 1507.2(3) pm, α = 98.86(3)°, β = 109.63(2)°, γ = 114.88(2)°, and Z = 2. Both compounds form arrays of eight‐membered rings (SnOPO) 2 linked at the tin atoms to form chains of infinite length. The dimer 3 consists of a like ring, in which the tin atoms are bridged by methoxo groups. It crystallizes triclinic in space group ${\rm P}{\bar 1}$ with a = 946.4(1) pm, b = 963.7(1) pm, c = 1174.2(1) pm, α = 82.495(6)°, β = 66.451(6)°, γ = 74.922(6)°, and Z = 1 for the dimer. The Raman spectra of 2 and 3 are given and discussed.