Preparation and properties of dimeric tetra-alkyldistannoxane derivatives: XR2SnOSnR2OH and XR2SnOSnR2OR′

Lipase-Catalyzed Transformation of Unnatural-Type Poly(3-hydroxybutanoate) into Reactive Cyclic Oligomer

“…18-Crown-6 was purchased from Aldrich Chemical Co. (Milwaukee, WI, USA), and used after recrystallization from acetonitrile. 1,3-Dichlorotetrabutyldistannoxane was prepared from dibutyltin dichloride according to the literature [17,18] and used after recrystallization from hexane (mp = 113-116 8C, lit. 114 8C [17] ).…”

Transients from a mixture of [(R(O)Sn)2C(CH3)2]2 and (RCl2Sn)2C(CH3)2 [R = (SiMe3)2CH]: an identification in situ by 1D 119Sn and 2D 1H119Sn HMQC NMR spectroscopy and electrospray mass spectrometry

“…Thus, the positive-ion electrospray mass spectrum of a solution of two mole equivalents of A and one mole equivalent of B exhibits, in addition to isotopic cluster patterns centered at m/z 685, m/z 705, and m/z 1261 and assigned to [ 4 Cl isotopic profile, is assigned to the cation of species C being in equilibrium with C (Scheme 2). In fact, the existence of such an equilibrium is in agreement with the observation of the 119 Sn C1 resonance shifting to higher frequency at low temperature (Fig.…”

Ring-opening copolymerization of α-chloromethyl-α-methyl-β-propionolactone with ɛ-caprolactone

“…It was dried over CaH 2 , and freshly distilled under reduced pressure prior to copolymerization. 16) . o-Dichlorobenzene was distilled under nitrogen over 4 Å molecular sieves and used to dissolve the above catalysts.…”