Redirected from Railroads of the United States of America
total: 240,000 km mainline routes (nongovernment owned),
standard gauge (1.435 m) (1989)
See also Transportation in the United States.
... termed the dienophile) to form a substituted cyclohexene system is called the Diels-Alder Reaction. The reaction can proceed even if some of the atoms in the newly-formed ...
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