156089-43-9Relevant academic research and scientific papers
ELECTRON DONORS FOR ZIEGLER-NATTA PRECATALYST PREPARATION AND CATALYST SYSTEM FOR OLEFIN POLYMERIZATION
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Paragraph 0147; 0150, (2020/01/24)
A solid precatalyst component for use in olefmic polymerization, includes titanium, magnesium, and an electron donor Ccompound; wherein: the electron donor compound is at least one compound represented by Formula (I).
Homologation of halostannanes with carbenoids: a convenient and straightforward one-step access to α-functionalized organotin reagents
Touqeer, Saad,Castoldi, Laura,Langer, Thierry,Holzer, Wolfgang,Pace, Vittorio
supporting information, p. 10112 - 10115 (2018/09/13)
A direct, single synthetic homologative transformation of halostannanes into mono- or di-substituted methyl analogues is documented. Critical for the success of the operation is the excellent nucleophilicity of carbenoid-like methyllithium reagents (LiCHXY, X, Y = halogen, OR, and CN): by simply individuating the reagents' substitution pattern, the desired functionalized fragment is delivered to the electrophile. The wide scope of the protocol is evidenced also in the case of analogous halogermanium compounds. The tandem homologation-quenching with nucleophiles and the use of α-chloroallyllithium is also discussed.
Synthesis of (-)-(Acetoxymethyl)(hydroxymethyl)methyl(phenyl)germane by an Esterase-Catalyzed Transesterification: the First Enzymatic Synthesis of an Optically Active Germane
Tacke, Reinhold,Wagner, Stephan A.,Sperlich, Joerg
, p. 639 - 642 (2007/10/02)
The prochiral germane MePhGe(CH2OH)2 (1) was synthesized by a six-step synthesis starting from GeCl4 (3) Cl2Ge(CH2Cl)2 (4) --> Ph2Ge(CH2Cl)2 (5) --> (CF3S(O)2O)PhGe(CH2Cl)2 (6) --> MePhGe(CH2Cl)2 (7) --> MePhGe(CH2OAc)2 (8) --> 1>.Reaction of 1 with Ac2O/NEt3 (molar ratio 1:Ac2O = 1:1) gave the racemic germane rac-MePhGe(CH2OAc)(CH2OH) (rac-2).Stereoselective transesterification of 1 with vinyl acetate (acetate source and solvent), catalyzed by immobilized porcine liver esterase (PLE; E.C.-3.1.1.1), yielded the optically active germane (-)-MePhGe(CH2OAc)(CH2OH) (yield 57percent, enantiomeric purity 50percent ee). - Key Words: Germane, optically active / Biotransformation, stereoselective / Transesterification, enzymatic / Porcine liver esterase
