Verhalten methoxylhaltiger Verbindungen gegen Aluminiumbromid

Organocobalt cluster complexes. XVIII. Friedel-Crafts acylation of diarylacetylenedicobalt hexacarbonyl complexes. Dicobalt hexacarbonyl unit as a protecting group for the acetylene function

“…Bromination of this stilbene derivative gave 1,2-di-o-tolyl-l ,2dibromoethane, mp 170-173°( lit.18 mp 171-172°). Dehydrobromination was effected using the same procedure as above with 19.05 g (0.052 mol) of this dibromide. The acetylene did not precipitate when the reaction mixture was poured into cold water.…”

A Spectrophotometric Study of the Interaction of Bromine with Tetrakis-(p-methoxyphenyl)-ethylene1

“…205-207°. This cleavage gave results similar to those carried out with aluminum bromide. 19 The dihydroxybenzophenone was brominated directly in glacial acetic acid to give an 85% yield of 4,4'-dihydroxy-3,3',5,5'-tetrabromobenzophenone, m.p. 224-226°.20 A solution of 3.0 g. (0.0057 mole) of this ketone in 75 ml.…”

The Hydration of Unsaturated Compounds. X. The Role of the Oxonium Complexes in the Hydration of Mesityl Oxide and the Dehydration of Diacetone Alcohol1

“…Both forward and reverse reactions are first order with respect to the organic reactant, since Eq. 2 holds (k, + k-,)t = 2.303 logic e/(ex) (2) where x and e are the fractions of organic material converted at the time, t, and at equilibrium, respectively, and ki and k-i are the specific reaction rate constants for the hydration and dehydration reactions, respectively. This is shown by the straight line character of the plot of logia (e -x) against time where the starting material is either mesityl oxide or diacetone alcohol (Fig.…”