By E. CASPI, P. K. GROVER, (MRs.) N. GROVER, (MISS) E. J. LYNDE, and TH. NUSSBAUMER.Several deoxy-steroids of the C,, series with ring A aromatic have been prepared by the dienol-benzene rearrangement, and the rearrangement is shown to take a uniform course to yield the 4-methyl-substituted compound. Dehydration of 4,17a-dimethylcestra-l,3,5( lO)-trien-17@-01 yields the exocyclic-unsaturated 4methyl-17methyleneoestra-1,3,5( lo), 17(20)tetraene without structural rearrangement. This contrasts with observations reported for other series of steroids. Transesterification resulting from the decomposition of lithium aluminum hydride with ethyl acetate has been observed.
Emissions of nitrogen oxides from combustion processes should bc avoided since they contribute to the formation of acid rain and photoehemical smog. Following this aim, various primary measures have been developed to reduce the formation of nitrogen oxides during the combustion process. Staged combustion, meaning air Staging and fuel Staging, is known to be a suitable primary measure to minimize the NOx emissions caused by the nitrogen in the fuel. Research about air Staging for non-pulverized biomass combustion has already been done, whereas about fuel Staging no studies are published yet.
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