L,3-Dichloro-2-methylpropane

Methylcyclopropane shows strikingly different reactivity toward chlorine and bromine under radical chain conditions in CHjClj solution. The main product with chlorine is chloromethylcyclopropane (56%), along with smaller amounts of 1,3-dichlorobutane and l,3-dichloro-2-methylpropane. Bromine gives only... 

Problem 4.28 Give topological structural formulas for (a) propane, (b) butane, (c) isobutane, (d) 2,2-di-methylpropane, (e) 2,3-dimethylbutane, (/) 3-ethylpentane, (g) l-chloro-3-methylbutane, (h) 2,3-dichloro-2-methylpentane, (i) 2-chloro-2,4-trimethylpentane. 

Coupling reactions. Heteroatom-directed arylation of 2-arylpyridines with ArMgBr and (tmeda)ZnCl2 also requires Fe(acac)3, 1,10-phenanthroline, and an electron acceptor (e.g., l,2-dichloro-2-methylpropane). A redox cycle of the iron species is set up during the reaction. It is further shown that TMEDA and hexamethylenetetramine have cooperative... 

This molecule also has some symmetry, with two types of proton, and an A B ratio of 3 1. We expect a quartet for B with 8 in the range 3.5-4.5 (actually 8 4.1) and a doublet for A (81.6). l,2-Dichloro-2-methylpropane... 

Indanones. GO bubbled rapidly at 24-27° into a well-stirred of AlClg and benzene, then l,2-dichloro-2-methylpropane added drop wise during 3-5 hrs. with continued introduction of GO during and 0.5 hr. after the addition of the halide 2,2-dimethylindan-l-one. Y 74.5%. F. e., also prepn. of the above product from different startg. m., and rearrangement, s. H. A. Bruson and H. L. Plant, J. Org. Ghem. 32, 3356 (1967). 

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