Secondary caibon

O—CH2 bond) (78, 277). More precisely, the formation of the crystalline polymer in the presence of FeCla takes place according to such a mechanism, whereas the amorphous fraction of low or zero rotatory power produced at the same time contains a sizeable number of head-to-head, tail-to-tail sequences originating from reaction at the secondary caibon [O—CH(CH3) bond] with inversion of configuration (278). From a single enantiomer, for example, (5), one obtains, by attack at the primary caibon, a noninverted unit with (5) configuration and, by attack at the secondary carbon, an inverted unit with (R) configuration (279). 

Caibon disulfide reacts with piimaiy and secondary amines to yield substituted ammonium salts of N-substituted dithiocarbamic acids, RNHC(S)SNH3R and R2NC(S)SNH2R2 ... 

The nitrobenzyl caibonates were prepared to protect a secondary hydroxyl group in a thienamycin precursor. The o-nitrobenzyl carbonate was prepared from the chloroformate (DMAP, CH2CI2, 0° - 20°, 3 h) and cleaved by irradiation, pH 7. The p-nitrobenzyl carbonate was prepared from the chloroformate (—78°, n-BuLi, THE, 85% yield) and cleaved by hydrogenolysis (H2/Pd-C, dioxane, H2O, EtOH, K2HP04). It is also cleaved by electrolytic reduction. ... 

Ohkuma H, Uechi I, Matsui M, Takeda Y, Yamamoto O, Imanishi N (2014) Stability of caibon electrodes for aqueous lithium-air secondary batteries. J Power Sources 245 942... 

It is possible to adjust the ratio of hydrogen to caibon oxides by the addition of caibon dioxide to the synthesis gas, either just before the methanol synthesis loop, or directly into the feed for the steam reformer. It is also possible to use a secondary reformer using oxygen rather than air, after the primary reformer. The amount of oxygen used is adjusted to provide the stoichiometric ratio of hydrogen and carbon oxides and, at the same time, reduce the amount of inert methane in synthesis gas. (Table 9.9)... 

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