Styrene type olefins, hydrogenation

The Rh(COD) and (7 ,5 )-DuanPhos(215)BF4-catalysed hydrogenation of styrene-type olefins with a 2 -hydroxyl substituent by H2 in CH2CI2 gave S) product in... 

A patent (6) assigned to the Societe Nationale des Petroles d Aqui-taine covers the use of, for example, a polymer made by the interaction of epichlorohydrin, hydrogen sulfide, and alkali or alkaline earth polysulfide in aqueous solution. This polymer, HS—[CH2—CHOH—CH2— S]nH where n = 4-24, is mixed with elemental sulfur, a polyolefin (e.g. polybutene), and an olefin (e.g. styrene). This type of mixture, after heating at 140-160 °C, has been used for traffic striping and is said to be serviceable without flaking after 1 years use, despite heavy traffic. 

Di-iminosuccinonitrile (506) is prepared by the base-catalysed addition of hydrogen cyanide to cyanogen and undergoes two types of addition with nucleophilic olefins. Thus styrene gives the aziridine (507) whereas /Nmeth-> oxystyrene yields the tetrahydropyrazine (508). Aziridine formation occurs with >98% retention of olefin stereochemistry, as shown using cis- and... 

Precatalysts of the type [PhBP 3]Fe-R and [PhBP %]Fe(H)3(PR3) are able to promote the hydrogenation of olefins (Scheme 4—333). The latter are less active than the former with much lower turnover frequency (TOF) values for the transformation of styrene. The redox couple Fe(II)/(IV) is supposed to be relevant for the reaction mechanism. 

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