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An efficient method for the synthesis of M2B10H14 (M = Na and K) has been developed. The two possible formation mechanisms of the B10H142− anion are proposed, in which the NH2BH3− anion acts as a proton abstractor and a hydride donor. Furthermore, the B10H13− and B10H15− intermediates were detected. [ABSTRACT FROM AUTHOR]

All-solid-state K batteries are ideal energy storage devices for grid-scale applications of renewable energies. A novel electrolyte K[B3H7NH2BH2NH2B3H7] with weakly coordinating anions was synthesized. It has a high K+ conductivity of 1.01 × 10−4 S cm−1 at 75 °C, which is probably due to the increased electrostatic potential and size of the anions. [ABSTRACT FROM AUTHOR]

A safe and efficient synthetic method for MB3H8 (M = Na, K, Rb and Cs) has been developed with excellent yields by directly reacting the corresponding MBH4 with the dimethyl sulfide borane complex (DMS·BH3). A general mechanism for constructing B3H8−, a basic unit for building polyhedral boranes, has been unravelled. [ABSTRACT FROM AUTHOR]

Herein, a highly regioselective propargylic benzylation with propargylic carbonates and benzyl 1,4-dihydropyridine derivatives was developed via a photoredox/palladium dual-catalyzed process, which represents a novel catalytic model for non-terminal propargylic functionalization. The reaction showed excellent regioselectivity and functional group compatibility. A radical coupling mechanism between the propargylic radical and benzyl radical was proposed. [ABSTRACT FROM AUTHOR]

B/N anionic aminoborane linear or branched chain complexes, [BH3(NH2BH2)nH]− (n = 1, 2, and 3) and [BH(NH2BH3)3]−, have been synthesized through the controlled reactions of ammonia borane (NH3BH3) with NaH by adjusting the reactant ratios and reaction temperatures. The possible reaction mechanisms were elucidated based on experimental and theoretical studies. [ABSTRACT FROM AUTHOR]

Long-sought mechanisms for the conversion of diammoniate of diborane ([NH3BH2NH3]+[BH4]−) into NH3BH3 and [NH2BH2]n as well as ammonium aminodiborane ([NH4]+[BH3NH2BH3]−) into a butane analogue, NH3BH2NH2BH3, have been elucidated on the basis of extensive experimental and theoretical studies. The [NH4]+ ammonium cation and the (η2-H2)BH2R moiety are found to be critical in B/N chain expansion. [ABSTRACT FROM AUTHOR]

Octahydridoborate, i.e. [B3H8]− containing compounds, have recently attracted interest for hydrogen storage. In the present study, the structural, hydrogen storage, and ion conductivity properties of KB3H8 have been systematically investigated. Two distinct polymorphic transitions are identified for KB3H8 from a monoclinic (α) to an orthorhombic (α′) structure at 15 °C via a second-order transition and eventually to a cubic (β) structure at 30 °C by a first-order transition. The β-polymorph of KB3H8 displays a high degree of disorder of the [B3H8]− anion, which facilitates increased cation mobility, reaching a K+ conductivity of ∼10−7 S cm−1 above 100 °C. β-KB3H8 starts to release hydrogen at ∼160 °C, simultaneously with the release of B5H9 and trace amounts of B2H6. KBH4 and K3(BH4)(B12H12) are identified as crystalline decomposition products above 200 °C, and the formation of a KBH4 deficient structure of K3−x(BH4)1−x(B12H12) is observed at elevated temperature. The hydrogen-uptake properties of a KB3H8–2KH composite have been examined under 380 bar H2, resulting in the formation of KBH4 at T≥ 150 °C along with higher metal hydridoborates, i.e. K2B9H9, K2B10H10, and K2B12H12. [ABSTRACT FROM AUTHOR]

An efficient synthetic method for MB3H8 (M = Li and Na) has been developed with improved yields on the basis of the investigation of the interconversion between THF·B3H7 and corresponding MB3H8. The mechanism was tentatively proposed based on the understanding of the nucleophilicity of the B–H bonding pair electrons. [ABSTRACT FROM AUTHOR]

There exists an interplay between borane and a Lewis base in their adducts. However, studies on these adducts so far have mainly focused on the different reactions of B-H bonds with limited attention given to the influence of borane on the chemistry of the Lewis base, except for BF 3 and BAr 3 . Herein, we have synthesized novel borane adducts with pyridine derivatives, Py·B 3 H 7 , in which the coordination of B 3 H 7 efficiently achieved the intra-molecular charge transfer. The strong B-N bond in these adducts resulted in the formation of stable dearomatic intermediates of pyridine derivatives, confirmed by 1 H and 11 B NMR spectroscopy, from which different reactions have transpired to realize C(sp 3 )-H and C(sp 2 )-H functionalization under mild conditions. The B 3 H 7 pyridine derivatives are stable and do not dissociate or decompose during the reaction process. The high stability of the B-N bond makes this method a good option for boron-containing drugs with potential for use in boron neutron capture therapy (BNCT)., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)

An efficient method for the synthesis of M 2 B 10 H 14 (M = Na and K) has been developed. The two possible formation mechanisms of the B 10 H 14 2- anion are proposed, in which the NH 2 BH 3 - anion acts as a proton abstractor and a hydride donor. Furthermore, the B 10 H 13 - and B 10 H 15 - intermediates were detected.

All-solid-state K batteries are ideal energy storage devices for grid-scale applications of renewable energies. A novel electrolyte K[B 3 H 7 NH 2 BH 2 NH 2 B 3 H 7 ] with weakly coordinating anions was synthesized. It has a high K + conductivity of 1.01 × 10 -4 S cm -1 at 75 °C, which is probably due to the increased electrostatic potential and size of the anions.

A safe and efficient synthetic method for MB 3 H 8 (M = Na, K, Rb and Cs) has been developed with excellent yields by directly reacting the corresponding MBH 4 with the dimethyl sulfide borane complex (DMS·BH 3 ). A general mechanism for constructing B 3 H 8 - , a basic unit for building polyhedral boranes, has been unravelled.

Correction for 'Unravelling a general mechanism of converting ionic B/N complexes into neutral B/N analogues of alkanes: Hδ+Hδ- dihydrogen bonding assisted dehydrogenation' by Xi-Meng Chen et al., Chem. Commun., 2019, 55, 12239-12242.

B/N anionic aminoborane linear or branched chain complexes, [BH3(NH2BH2)nH]- (n = 1, 2, and 3) and [BH(NH2BH3)3]-, have been synthesized through the controlled reactions of ammonia borane (NH3BH3) with NaH by adjusting the reactant ratios and reaction temperatures. The possible reaction mechanisms were elucidated based on experimental and theoretical studies.

Long-sought mechanisms for the conversion of diammoniate of diborane ([NH3BH2NH3]+[BH4]-) into NH3BH3 and [NH2BH2]n as well as ammonium aminodiborane ([NH4]+[BH3NH2BH3]-) into a butane analogue, NH3BH2NH2BH3, have been elucidated on the basis of extensive experimental and theoretical studies. The [NH4]+ ammonium cation and the (η2-H2)BH2R moiety are found to be critical in B/N chain expansion.

Octahydridoborate, i.e. [B 3 H 8 ] - containing compounds, have recently attracted interest for hydrogen storage. In the present study, the structural, hydrogen storage, and ion conductivity properties of KB 3 H 8 have been systematically investigated. Two distinct polymorphic transitions are identified for KB 3 H 8 from a monoclinic (α) to an orthorhombic (α') structure at 15 °C via a second-order transition and eventually to a cubic (β) structure at 30 °C by a first-order transition. The β-polymorph of KB 3 H 8 displays a high degree of disorder of the [B 3 H 8 ] - anion, which facilitates increased cation mobility, reaching a K + conductivity of ∼10 -7 S cm -1 above 100 °C. β-KB 3 H 8 starts to release hydrogen at ∼160 °C, simultaneously with the release of B 5 H 9 and trace amounts of B 2 H 6 . KBH 4 and K 3 (BH 4 )(B 12 H 12 ) are identified as crystalline decomposition products above 200 °C, and the formation of a KBH 4 deficient structure of K 3-x (BH 4 ) 1-x (B 12 H 12 ) is observed at elevated temperature. The hydrogen-uptake properties of a KB 3 H 8 -2KH composite have been examined under 380 bar H 2 , resulting in the formation of KBH 4 at T≥ 150 °C along with higher metal hydridoborates, i.e. K 2 B 9 H 9 , K 2 B 10 H 10 , and K 2 B 12 H 12 .

An efficient synthetic method for MB3H8 (M = Li and Na) has been developed with improved yields on the basis of the investigation of the interconversion between THF·B3H7 and corresponding MB3H8. The mechanism was tentatively proposed based on the understanding of the nucleophilicity of the B-H bonding pair electrons.