Haloalkanesulfonyl bromides including chloromethanesulfonyl bromide (1), bromomethanesulfonyl bromide (2), -bromoethanesulfonyl bromide (3), and iodomethanesulfonyl bromide (4) undergo free radical addition to olefins giving adducts which upon treatment with base afford dienes by a process termed the vinylogous Ramberg-Backlund reaction. In appropriate cases regioselectivity and/or stereoselectivity is observed in both the first addition step and in subsequent base-promoted elimination steps. Using this twoor three-step procedure, 1-alkenes are converted into 1,3-alkadienes, 2-methyl-1-alkenes into 2-alkyl-1,3-butadienes, methylenecycloalkanes into 1-vinyl-1-cycloalkenes, cycloalkenes into 3-methylene-1 -cycloalkenes, and 1 -methylcycloalkenes into 1,2-dimethylenecycloalkanes among other examples. Reagents 1-4 can also be used to convert trimethylsilyl enol ethers into -alkylidene ketones and 1,3-oxathiole 3,3-dioxides, 1,3-dienes into 1,3,5-trienes, and alkynes

The preparations and structures determined by X-ray diffraction of the following complexes of bis-(chlorodimethylstannyl)methane and bis(dichloromethylstannyl)methane with aromatic nitrogen heterocycles are described: CH2(ClMe2Sn)2-C5H6N (1) (C5H4N = pyridine); CH2(ClMe2Sn)2-C4H4N2 (2) (C4H4N2 = pyridazine); CH2(Cl2MeSn)2-2C4H4N2 (3) (C4H4N2 = pyridazine); CH2(ClMe2Sn)2-2C3H4N2 (4) (C3H4N2 = pyr azole); CH2(ClMe2Sn)2-C4H4N2 (5) (C4H4N2 = pyrazine); CH2(Cl2MeSn)2-C4H4N2 (6) (C4H4N2 = pyrazine); CH2(Cl2MeSn)2-bpy (7) (bpy = bipyridyl). Crystal data are as follows. 1: triclinic PI, o = 7.192

The synthesis and characterization of pseudo or semi‐ and full‐interpenetrating polymer networks (IPNs) of poly(2,6‐dimethyl‐1,4‐phenylene oxide) and polydimethylsiloxane were performed. We observed that in full IPNs, the elasticity of the IPN samples increased very drastically, as the composition of polydimethylsiloxane increased (i.e. 0–60%) while the tensile strength (TS) and the glass transition temperature (Tg) decreases. The pseudo IPNs appeared to consist of two phases while the full IPNs of lower siloxane content were miscible.

Abstract. M r= 387.1, monoclinic, P2Jc, a = 13.159 (5), b--9.372 (4), c= 15.468 (3) A, fl= 100.99 (2) °, V= 1873 (1) A 3, F(000) = 1424, Z= 8, D x = 2.75 g cm -a, Mo Ka, 2 = 0.71069 A, /z = 159.0cm -~, room temperature, final R=0.031 for 2122 reflections. The Pt displays square-planar coordination with cis CI donors. The methylsulfinylpropylamine ligand is bidentate, coordinating through the amine N and the S of the sulfoxide group. The six-membered chelate ring PtNCCCS displays a chair conformation.