Bromo-terminated molecules

Dense polymer structures with well-controlled compositions and dimensions are preferentially grown from a wide range of surfaces by atom transfer radical polymerization (ATRP). Different bromo-terminated molecules ranging from silanes, thiols, or disulfides to aromatic moieties derived from diazonium ions " have been proposed to initiate the polymer growth. 

The fact that we have three olefinic hydrogens means that our compound is a primary olefin, the fact that the other two carbons are both methylene carbons means that our substituent, bromine, is terminal. Thus the only possibility we have is that we are dealing with 4-bromo-1-butene (try to find another isomer that fits ). But this simple molecules has a highly complex proton spectrum, which can only be interpreted completely (exact chemical shift, coupling constants) by spectrum simulation. 

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