2658.     PETROV, A. D., AND VITTIKH, M. V.  [Synthesis and Properties of Isoparaffinic Hydrocarbons of the Composition C13-C24.]  Bull. acad. sci. U.R.S.S., Classe sci. chim. 1944, English summary, pp. 238-242; Chem. Abs., vol. 39, 1945, p. 1618.

        Pr hexyl ketone was treated with CH₂:CHCH₂MgCl to yield hexylpropylallylcarbinol, b₇ 116°-118°, d²⁰₂₀ 0.8482, n¹⁵_D 1.4535; dehydration over Al₂O₃ gave a mixture of 4-propyl-1,3-decadiene and 4-propyl-1.4-decadiene, b₆ 85°-88°; hydrogenation over Pt black gave 4-propyldecane, b. 214.5°-215.5°, d²⁰₂₀ 0.7716, n²⁰_D 1.4354.  Dihexyl ketone treated with BuMgBr gave 7-butyl-7-tridecanol, b₁₀ 163°-165°, d²⁰₂₀ 0.8350, n²⁰_D 1.4355.  Crude methyldioctylcarbinol (admixed with some olefin) was prepared from EtOAc and C₈H₁₇ MgBr; this was dehydrated by boiling with I to yield 9-methylheptadecene, boiling at 169°-174° (no pressure given), d²⁰₄ 0.7916, n²⁰_D1.4472, freezing point 26.5°; hydrogenation of the latter over Ni gave 9-methylheptadecane, b₁₀ 172°-174°, d²⁰₄ 0.7810, n²⁰_D 1.4388.  C₈H₁₇ MgBr and dihexyl ketone gave 7-hexyl-7-pentadecanol, b₇ 196°-197°, d²⁰₂₀ 0.8420, n²⁰_D 1.4519; dehydration with I gave an isomer mixture b₇ 181.5°-183°; hydrogenation of the mixture over Ni oxide at 220°-250° gave 7-hexylpentadecane, b_9.5 182°-183°, d²⁰₂₀ 0.7923, n²⁰_D 1.4419.  Et caprylate and C₈H₁₇ MgBr gave a mixture of 9-heptyl-9-heptadecanol and its dehydration product (pure alcohol b₉ 230°-231°, d²⁰₂₀ 0.8470, n²⁰_D 1.4538); after the usual dehydration the olefin mixture b₉ 206°-212° was hydrogenated over Ni at 250° to yield 9-heptylheptadecane, b₈ 210°, d²⁰₂₀ 0.8009, n²⁰_D 1.4465.  The C₁₇, C₂₁, and C₂₄ compounds have cetane numbers near 100 and have satisfactorily low melting points in the continued study of compounds having good antidetonating properties.

        PETROVA, L. V.  See abs. 804.

        PETROVA, N. Y.  See abs. 279, 281, 282.