Abstract Hydroboration of alkynes is special interest to researchers since it the most straightforward process for synthesis highly important vinylborane synthetic intermediate compounds. It significant in terms both regioselectivity and stereoselectivity, several positional isomers are formed during hydroboration. Given importance this class compounds, an extensive study has been carried out regarding catalytic condition development detailed mechanistic studies selectively obtaining a...

The reactions of 1,3-bis(2,6-diisopropylphenyl)imidazolin-2-imine (Im(Dipp)NH, 1-H) with trimethylsilylmethyl lithium (LiCH(2)SiMe(3)) and anhydrous rare earth metal trichlorides MCl(3) afforded the imidazolin-2-iminato complexes [(1)MCl(2)(THF)(3)] (2a, M = Sc; 2b, Y; 2c, Lu) [(1)GdCl(2)(THF)(2)] x [LiCl(THF)(2)] (2d). Treatment 2 dipotassium cyclooctatetradienide, K(2)(C(8)H(8)) resulted in formation two- or three-legged piano-stool type [(eta(8)-C(8)H(8))M(1)(THF)(n)] (3a, Sc, n 1; 3b, Y,...

Abstract We demonstrate an efficient protocol for the chemoselective hydroboration of organic nitriles with pinacolborane (HBpin) and catecholborane (HBcat) using aluminum alkyl complex [ κ 2 ‐{2‐F−C 6 H 4 NP(Se)Ph } Al−(Me)] as a pre‐catalyst to afford diboryl amines under solvent‐free mild conditions (60 °C) in high yield. The was prepared by reaction [2‐F−C NHP(Se)Ph ] trimethylaluminum toluene. solid‐state structure Al is established. Nitriles wide array electron‐withdrawing...

Catalytic hydroboration of aldehydes and ketones with pinacolborane (HBpin) catalytic cyanosilylation carbonyl compounds trimethylsilyl cyanide using alkali metal (Li, Na, K) complexes as precatalysts under mild conditions are reported.

Sodium and potassium cyclopentadienide were obtained in an improved synthetic procedure. They prepared a one-pot synthesis directly by reaction of alkali metals with neat dicyclopentadiene at elevated temperature. The products precipitated as white powders isolated filtration. excess can be recycled. new procedure provides much more convenient access to the products, no dry solvents such THF or decahydronaphthalene are needed, colored impurities observed.

A series of cyclooctatetraene bis(phosphinimino)methanide complexes yttrium and the lanthanides, [{CH(PPh2NSiMe3)2}Ln(η8-C8H8)] (Ln = Y, Sm, Er, Yb, Lu), were synthesized via three different pathways. The title compounds can be obtained either from [(η8-C8H8)LnI(THF)3] K{CH(PPh2NSiMe3)2} or K2C8H8 [{CH(PPh2NSiMe3)2}LnCl2]2. In a third approach in one-pot reaction starting K{CH(PPh2NSiMe3)2}, LnCl3, K2C8H8. All have been characterized by crystal X-ray diffraction. solid-state structures these...

Abstract The imidazolin‐2‐imino‐functionalized tetramethylcyclopentadiene, 3 ‐H, has been prepared by the reaction of two equivalents 1,3‐diisopropyl‐4,5‐dimethylimidazolin‐2‐imine ( 1 ) with 5‐(chlorodimethylsilyl)‐1,2,3,4‐tetramethyl‐1,3‐cyclopentadiene 2 ). reactions ‐H trimethylsilylmethyl (neosilyl) [Ln(CH SiMe (THF) ] (Ln = Sc, Y, Lu) complexes afford tetramethylsilane and constrained‐geometry [(η 5 :η ‐ )Ln(CH 4a ; Ln 4b Lu, 4c complexes, whereas analogousbis(trimethylsilyl)amido...

Abstract The coordination chemistry of imidazolin‐2‐iminato ligands towards rare earth metal atoms is reviewed. structural characterization a large number mono‐, bis‐ and tris(imidazolin‐2‐iminato) complexes – in most cases scandium, yttrium, gadolinium, lutetium reveals almost exclusively the formation mononuclear with very short metal–nitrogen bonds, which confirms ability to efficiently act as imido‐type 2σ,4π‐electron donors. In particular, mono(imidazolin‐2‐iminato) dichlorides proved...

Abstract We report the N−H/H−Si cross‐dehydrogenative coupling (CDC) of hydrosilanes and amines with high conversion (>90 %) chemoselectivity for production silazanes, using group 1 metal hexamethyldisilazides [MN(SiMe 3 ) 2 ] (M=Li, Na, K) as precatalysts under mild conditions. [KN(SiMe showed higher activity than congeneric lithium sodium salts. The catalyzed CDC reaction displays a broad substrate scope. Phenylsilane diphenylsilane react number ambient conditions; more elevated...

We report the development of a facile protocol for deoxygenative hydroboration aliphatic and aryl carboxylic acids to afford corresponding primary alcohols under solvent-free catalyst-free conditions. The reaction proceeds ambient temperature exhibits good tolerance towards various functional groups generates quantitative yields. plausible mechanism involves formation Lewis acid-base adducts as well liberation hydrogen gas.

We report a series of titanium and zirconium complexes supported by dianionic amidophosphine-borane ligands, synthesized amine elimination salt metathesis reactions. The TiIV complex [{Ph2P(BH3)N}2C6H4Ti(NMe2)2] (1) was obtained the reaction between tetrakis-(dimethylamido)titanium(IV) protic aminophosphine-borane ligand [{Ph2P(BH3)NH}2C6H4] (LH2) at ambient temperature. Both heteroleptic complexes-[η5-(C5H5)2Zr{Ph2P(BH3)N}2C6H4] (2) [[{Ph2P(BH3)N}2C6H4]ZrCl2] (3)-and homoleptic...

Catalytic chemo-selective reduction of <italic>tert</italic>-amides with pinacolborane (HBpin) to furnish the corresponding <italic>tert</italic>-amines using an Earth-abundant Al complex under solvent-free, base-free and mild conditions is reported.

Abstract This review discusses the immense progress made over recent years in metal‐free catalytic hydroboration. Reactions with several unsaturated functional groups, such as alkynes, alkenes, carbonyl compounds, carbon dioxide, carbodiimides, imines, allenes, pyridines, carboxylic acid derivatives etc., have been explored. Although there are significant developments hydroboration reactions using metal‐based catalysts, strategies more desirable from a sustainability perspective....

An organomagnesium complex containing an imino-phosphanamidinate ligand was found to be a competent catalyst for the ROP of rac-LA and ε-CL as well their copolymerization via sequential addition monomers, resulting in formation PCL-b-PLA diblock copolymer. The polymers obtained were characterized by 1H, 13C, DOSY NMR, DSC, TGA, POM, SEM.

Abstract Xanthene derivatives are prepared by using tantalum(V) oxide (Ta 2 O 5 )‐supported heteropoly acid (HPA), Keggin 12‐phosphotungstic (PTA)‐based heterogeneous catalyst PTA@Ta under neat conditions. The composite is the wetness impregnation method and characterized various techniques. Under optimized conditions, xanthenes synthesized with prominent yields in remarkably short reaction times. green chemistry metrics appraised for xanthene reaction. Surprisingly, a few novel naphthopyran...

A facile mono- and di-hydrosilylation of various carbonyls is reported under mild reaction conditions to afford silyl ether-protected alcohols in a single step using novel zinc complexes supported by amidophosphinochalcogenide ligand moieties.

A series of amidinato‐supported magnesium neosilyl complexes with the general formula [Mg(CH2SiMe3)‐{RN=C(CH2SiMe3)NR}]2 (R = tBu, 1a; R Cy, 1b; iPr, 1c) were prepared in excellent yields by insertion a carbodiimide motif magnesium–carbon bond complex [Mg(CH2SiMe3)2]. homoleptic [Mg{tBuN=C(CH2SiMe3)NtBu}2] (2a) was also using [Mg(CH2SiMe3)2] and di‐tert‐butylcarbodiimide 1:2 molar ratio toluene. The molecular structures all 1a‐1c 2a their solid state confirmed single crystal X‐ray...

We successfully prepared and characterized a wide variety of group 3 metal complexes containing dianionic or monoanionic glyoxal-based N,N′-bis(2,6-diisopropylphenyl)-1,4-diaza-1,3-butadiene (DAD) ligand using salt metathesis reaction trichlorides with the dipotassium DAD direct reduction 1:1 mixture powders halides. The coordinated to in σ2-enediamide manner for dimeric yttrium, ytterbium, europium complexes, whereas σ2,π-enediamide coordination was observed lanthanum complex, due different...