The second part of this compendium concludes with a collection of phase change enthalpies of organic molecules inclusive of C11–C192 reported over the period 1880–2015. Also included are phase change enthalpies including fusion, vaporization, and sublimation enthalpies for organometallic, ionic liquids, and a few inorganic compounds. Paper I of this compendium, published separately, includes organic compounds from C1 to C10 and describes a group additivity method for evaluating solid, liquid, and gas phase heat capacities as well as temperature adjustments of phase changes. Paper II of this compendium also includes an updated version of a group additivity method for evaluating total phase change entropies which together with the fusion temperature can be useful in estimating total phase change enthalpies. Other uses include application in identifying potential substances that either form liquid or plastic crystals or exhibit additional phase changes such as undetected solid–solid transitions or behave ani...

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Phase Transition Enthalpy Measurements of Organic and Organometallic Compounds and Ionic Liquids. Sublimation, Vaporization, and Fusion Enthalpies from 1880 to 2015. Part 2. C11–C192

https://pubs.rsc.org/en/content/articlepdf/2016/cy/c6cy01266c

An experimental and theoretical study into the facile, homogenous (N-heterocyclic carbene) 2 -Pd(0) catalyzed diboration of internal and terminal alkynes

Organoboron compounds are part of many synthetic routes and target compounds for bio- and medicinal applications. One origin for their preparation was by means of direct interaction between Cl 2 B–BCl 2 and unsaturated organic compounds, but progress toward simple and convenient diboron reagents put tetra(alkoxy)diborons in the spotlight. The less reactive B B bond in tetra(alkoxy)diborons requires transition metal complexes to activate the diboron and transfer the boryl units to unsaturated substrates. Importantly, the mode of activation differs from the metal involved and is also influenced by the ligands modifying the metal center. Oxidative addition and σ-bond metathesis are the most representative modes of activation, and metal complexes become catalytic systems by completing the substrate transformation into the desired organoboron compound. Selectivity is a fundamental issue in the activation and precise delivery of the boryl moiety to the unsaturated substrate. Particularly, asymmetric induction is accomplished by the enantioselective influence of the chiral ligands around the metal centers. Even nanoparticles are known to activate diboron reagents and provide chemoselective diboration processes. The power of diboron reagents in organoboron synthesis is pushing the search of new activation modes, and nowadays, the sole presence of Lewis bases can also play a definitive role to generate Lewis acid–base adducts that directly interact with unsaturated substrates in a fashionable way. Each situation requires the use of the appropriate mode of activation of diboron reagents, and here we collect these singular metal activation modes and analyze their advantages and limitations.

Singular Metal Activation of Diboron Compounds

http://link.springer.com/content/pdf/10.1007/978-94-010-1298-0_2.pdf

A.F Webb

Papers

The standard enthalpy of formation of tetramethoxydiboron