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Chargaffs rule. in dna the number of adenine units equals the number of thymine units; likewise, the number of guanine units equals the number of cytosine units.
Zaitsev's rule (or Saytseff's rule, Saytzev rule) is an empirical rule for predicting the favored alkene product(s) in elimination reactions. While at the University of Kazan, Russian chemist Alexander Zaitsev studied a variety of different elimination reactions and observed a general trend in the resulting alkenes.or example, when 2-iodobutane is treated with alcoholic KOH, 2-butene is the major product and 1-butene is the minor product. More generally, Zaitsev's rule predicts that in an elimination reaction, the most stable alkene â typically the most substituted one â will be the favored product.