PERENCANAAN KEBUTUHAN MATERIAL (PKM) PADA PRODUKSI KINCIR ANGIN KAPASITAS 100 WATT

Banda Ace

Dynamic behaviour of monohaptoallylpalladium species: internal coordination as a driving force in allylic alkylation chemistry

Contemporary catalytic procedures involving alkylpalladium(II) have enriched the arsenal of synthetic organic chemistry. Those transformations usually rely on internal coordination through “directing groups”, carefully designed to maximize catalytic efficiency and regioselectivity. Herein, we report structural and reactivity studies of a series of internally coordinated monohaptoallylpalladium complexes. These species enable the direct spectroscopic observation and theoretical study of π–σ–π interconversion processes. They further display unusual dynamic behavior which should be of direct relevance to chemistries beyond catalytic allylic alkylation

CCDC 909044: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures

CCDC 909045: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures

Reactivity of Lewis Acid Activated Diaza- and Dithiaboroles in Electrophilic Arene Borylation

Hydride abstraction from <i>N,N</i>′-bis­(adamantyl)-1-hydrido-1,3,2-benzodiazaborole with catalytic [Ph₃C]­[<i>closo</i>-CB₁₁H₆Br₆] resulted in a low yield of arene borylation and a major product derived from migration of both adamantyl groups to the arene backbone. In contrast, the related aryl-substituted diazaborole <i>N,N</i>′-(2,6-diisopropylphenyl)-1-bromo-1,3,2-diazaborole did not borylate benzene or toluene, being resistant to halide abstraction even with strong halide acceptors: e.g., [Et₃Si]­[<i>closo</i>-CB₁₁H₆Br₆]. The reactivity disparity arises from greater steric shielding of the boron p_<i>z</i> orbital in the 2,6-diisopropylphenyl-substituted diazaboroles. Boron electrophiles derived from 1-chloro-1,3,2-benzodithiaborole ((CatS₂)­BCl) are active for arene borylation, displaying reactivity between that of catecholato- and dichloro-boron electrophiles. [(CatS₂)­B­(NEt₃)]­[AlCl₄] is significantly less prone to nucleophile-induced transfer of halide from [AlCl₄]¯ to boron compared to catecholato<i> </i> and dichloro borocations, enabling it to borylate arenes containing nucleophilic −NMe₂ moieties in high conversion (e.g., <i>N,N</i>,4-trimethylaniline and 1,8-bis­(dimethylamino)­naphthalene). Calculations indicate that the magnitude of positive charge at boron is a key factor in determining the propensity of chloride transfer from [AlCl₄]¯ to boron on addition of a nucleophile

Reactivity of Lewis Acid Activated Diaza- and Dithiaboroles in Electrophilic Arene Borylation

Hydride abstraction from <i>N,N</i>′-bis­(adamantyl)-1-hydrido-1,3,2-benzodiazaborole with catalytic [Ph₃C]­[<i>closo</i>-CB₁₁H₆Br₆] resulted in a low yield of arene borylation and a major product derived from migration of both adamantyl groups to the arene backbone. In contrast, the related aryl-substituted diazaborole <i>N,N</i>′-(2,6-diisopropylphenyl)-1-bromo-1,3,2-diazaborole did not borylate benzene or toluene, being resistant to halide abstraction even with strong halide acceptors: e.g., [Et₃Si]­[<i>closo</i>-CB₁₁H₆Br₆]. The reactivity disparity arises from greater steric shielding of the boron p_<i>z</i> orbital in the 2,6-diisopropylphenyl-substituted diazaboroles. Boron electrophiles derived from 1-chloro-1,3,2-benzodithiaborole ((CatS₂)­BCl) are active for arene borylation, displaying reactivity between that of catecholato- and dichloro-boron electrophiles. [(CatS₂)­B­(NEt₃)]­[AlCl₄] is significantly less prone to nucleophile-induced transfer of halide from [AlCl₄]¯ to boron compared to catecholato<i> </i> and dichloro borocations, enabling it to borylate arenes containing nucleophilic −NMe₂ moieties in high conversion (e.g., <i>N,N</i>,4-trimethylaniline and 1,8-bis­(dimethylamino)­naphthalene). Calculations indicate that the magnitude of positive charge at boron is a key factor in determining the propensity of chloride transfer from [AlCl₄]¯ to boron on addition of a nucleophile