Irons-Decalin

There is an important difference between the cis- and irons-decalin systems with respect to their conformational flexibility. irans-Decalin because of the nature of the ring fusion, is inc able of ring inversion. ci5-Decalin is conformationally mobile and undergoes ring inversion at a rate only slightly slower than cyclohexane (AG = 12.3-12.4 kcal/mol)." The irons-decalin system than represents a conformationally locked system and can be used to determine the difference in stability and reactivity of groups in axial and equatorial environments. 

The bicyclic compound is a irons-decalin derivative. The fused nonhalogenated ring prevents the ring flip of the bromine-substituted ring necessary to give equatorial bromines. 

Carbazole will react with 1 or 2 mol of ferrocene in hot decalin in the presence of aluminium-aluminium chloride producing crystalline derivatives in which either one or both" of the benzene rings is linked to iron, 25 and 26, respectively. The sandwich compound 25 was deprotonated to 27 with sodamide in liquid ammonia. A chromium carbonyl complex 28... 

When the sonolysis is done in high-boiling organics, highly porous amorphous powders are formed. For example, an amorphous iron powder was produced by the sonocation of iron carbonyl in decalin. This powder was comprised of small crystallites (5 A) and had a surface area of 120 m /g ... 

Nussbaumer and Frdter have used a vinylogous carbonate as an enophile. Pyrolysis of a solution of (126) in toluene at 3(X) C for 9 h gives (127), an intermediate in a synthesis of CM-7-irone, in 25% yield as the only cyclization product. Acid-catalyzed cyclization of (126) gives only the isomer of (127) with an endocyclic double bond. Thomas and Lander-Schouwey found that pyrolysis of (128) in decalin at 3(X) C results in a retro-ene reaction to give propene and (129) which undergoes an intramolecular ene reaction to give (130). ... 

Hydroxylation of alkanes preferentially occurs at the more nucleophilic tertiary C—H positions, but some of these systems using 2-mercaptoethanoF or metallic iron powder d hydroxylate adamantane with preference for the secondary position. However, none of these systems hydroxylates cis-decalin with retention of configuration at the hydroxylated atom. ... 

More publications were found related to carbides. First, Suslick s early report [64] that certain carbonyls sonicated in a decalin solvent under argon. For Fe and Co, nanostructured metals are formed for Mo and W, metal carbides (e.g., M02C) are produced. Molybdenum carbide was used later as a catalyst. The selectivity and catalytic activity of the Mo and W carbides was examined in the dehydrogenation of alkanes [140]. Another carbide that has already been mentioned is that of Pd [65], which was prepared by Maeda s group. Iron carbide was a byproduct that served as protective layer in Nikitenko s work on air-stable iron nanoparticles [70]. 

Table 9-9, from Rowe and Dickert s investigation of solutions of diisopropyl dithiophosphates in n-hexadecane [19], lists the rates of wear in parallel with the coefficients of friction for steel against steel and copper against steel. A strong effect from the presence of dithiophosphate is seen for steel on steel in the sharp decrease in both the wear rates and the coefficients of friction relative to that with uncompounded hexadecane as the lubricant. For copper against steel, the wear rate decreases significantly, particularly with the metal salts of diisopropyl dithiophosphate, but the coefficient of friction is not altered systematically. Table 9-10 shows the frictional behavior of hardened alloy cast iron in the presence of decalin solutions of triphenyl phosphate and diphenyl phosphate [15]. The mechanisms governing the action of phosphates and dithiophosphates are discussed in Chapter 11. 

Representations of irons- and cis-decalin. The hydrogen atoms (red) at the bridgehead carbons are on the same side of the rings in the cis isomer but o opposite sides in the trans isomer. 

Iron phthalocyanine encaged in zeolite, Fe(Pc)/Z, was prepared by adding 5 g of air-dried NaY to 50 ml of a solution of 84 mg of ferrocene in acetone, followed by air-drying at 343 K [10]. The dried solid was mixed with 5 g of 1,2-dicyanobenzene and 15 ml of decalin, and was heated in an argon atmosphere. The solid material was soxhiet extracted with acetone, pyridine and again with acetone, until a colorless extract was obtained. Finally, the catalyst was dried at 343 K. 

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