Trimethyltin transfers

While the preparations of l-(trimethylsilyl)indene and l-(trimethylstannyl)-indene have been reported,4 there are no available preparations of l-(tributyl-stannyl)indene. We chose the tributyl analog because of the decreased toxicity of tributyltin reagents vs. trimethyltin reagents.5 A preparation for the synthesis of Mg(C9H7)2, another indenyl transfer agent, has appeared in Inorganic Syntheses.6... 

The reagent transfers the trimethyltin group to the (3-position of a variety of a,p-unsaturated esters, including acetylenic esters. It is generally superior to the lower-order cuprate [(CH3)3SnCuSC6H5]Li (10, 289). 

Dichlorobis(l-methyltetrazole) zinc(II) has been reported and its structure determined.111 The geometry around the zinc atom was that of a distorted tetrahedron. The tetrazoles were monodentate and again coordinated by a charge-transfer o-bond between the 4-N atom and the Zn which was coplanar with the ring.111 Cycloaddition of trialkyltin azides to nitriles or treatment of S-substituted tetrazoles with bis(tri-n-butyltin) oxide or trimethyltin hydroxide gave 2-jV-trialkyltin-5-substituted tetrazoles (67).112,113 The (tri-/i-butylstannyl)derivatives (68)... 

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