(1) The absorption spectra of six solutions of chromic chloride and sulphate hydrates were quantitatively measured in the ultra-violet region. (2) Violet chromic sulphate and chrome alum should respectively have the formula [Cr(H2O)6]2(SO4)3 and K[Cr(H2O)6] (SO4)2. (3) Chloro-aquo chromic salts were transformed into the hydroxopentaquo chromic salts in the solutions where the pH-values were higher than 4.0. (4) The substitution of a chlorine atom for a molecule of water in these salts caused the absorption band to shift in the direction of the increasing wave length and absorption capacity. (5) Following his method, the author has made a comparison of calculated and observed values of the absorption of green chromic chloride.
(1) It has been shown that the condensation of diethyl tartrate with cyclic ketones can be effected with great ease by the use of phosphorus pentoxide as condensation reagent. (2) New products obtained by condensing diethyl tartrate with cyclic ketones, namely cyclopentanone, cyclohexanone, and three isomeric methylcyclohexanones, have been described, and their physical constants have been compared in a table. (3) The molecular rotation of these homologous compounds decreases as the parachor of the ketone-residue in the condensation product increases, but the influence by the position of the substituent is noticed: the substitution of a methyl group at ortho-position is the most effective, and that of meta-position is nearly ineffective.
(1) The relation between the extent of addition of bromine to cinnamic acid in carbon tetrachloride and the amount of oxygen present has been shown. (2) It has been indicated that hydrogen bromide is indifferent to the reaction of bromine with cinnamic acid in carbon tetrachloride either in presence or in absence of oxygen. (3) The accelerating effect of benzoyl peroxide on the addition of bromine to cinnamic acid in carbon tetrachloride has been demonstrated. (4) In all cases, namely in vacuum and in the presence of any of oxygen, benzoyl peroxide, and hydrogen bromide, the products separating out in crystals were cinnamic acid dibromide melting at 198°. (5) All the results mentioned above were obtained from the additions in the dark at room temperature.