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Showing papers on "Nickel boride published in 2009"


Journal ArticleDOI
TL;DR: In this article, a variety of acids can be chemoselectively cleaved on treatment with nickel boride in methanol at ambient temperature to give the parent carboxylic acids in high yields.
Abstract: Benzyl esters of a variety of acids can be chemoselectively cleaved on treatment with nickel boride in methanol at ambient temperature to give the parent carboxylic acids in high yields. Other protecting functionalities such as methyl, ethyl, tert-butyl, and trityl esters as well as benzyl ethers, tert-butyl ethers, and N-benzylamides are unaffected under these conditions.

13 citations


Journal ArticleDOI
TL;DR: An efficient and inexpensive method using microwave-assisted irradiation with Ni 2 B for the syntheses of aromatic amines, pyrrolobenzodiazepines, as well as Pyrroloquinazolinones was developed in this article.
Abstract: An efficient and inexpensive method using microwave-assisted irradiation with Ni 2 B for the syntheses of aromatic amines, pyrrolobenzodiazepines as well as pyrroloquinazolinones was developed. This protocol was applied in the tandem resin-cleavage, azido reduction, and cyclization of compounds 3 and 5 that afforded substituted pyrrolo[2,1-c][1,4]benzodiazepines 4 and 6 in a one-pot manner. The microwave-assisted irradiation reactions enhanced yields with very short reaction times in contrast to the conventional thermal reactions.

3 citations


Journal ArticleDOI
TL;DR: Microwave assisted Azido reduction/tandem cyclization with Ni2B Nagula Shankaraiah,a Nagula Markandeya,b Marlene Espinoza-Moraga,a Claudia Arancibia,a Ahmed Kamal,*b Leonardo Silva Santos*a a Laboratory of Asymmetric Synthesis, Chemistry Institute of Natural Resources, University of Talca, P.O. Box 747, Chile E-mail: lssantos@utalca.res.cl b Chemical Biology Laboratory, Division of Organic Chemistry, Indian Institute of Chemical Technology
Abstract: Microwave-Assisted Azido Reduction/Tandem Cyclization with Ni2B Nagula Shankaraiah,a Nagula Markandeya,b Marlene Espinoza-Moraga,a Claudia Arancibia,a Ahmed Kamal,*b Leonardo Silva Santos*a a Laboratory of Asymmetric Synthesis, Chemistry Institute of Natural Resources, University of Talca, P.O. Box 747, Talca, Chile E-mail: lssantos@utalca.cl b Chemical Biology Laboratory, Division of Organic Chemistry, Indian Institute of Chemical Technology, Hyderabad 500007, India Fax +91(40)27193189; E-mail: ahmedkamal@iict.res.in Received 26 January 2009; revised 23 February 2009

3 citations



Patent
05 Aug 2009
TL;DR: In this paper, the authors proposed a method for producing high-purity nickel boride, which is stable in quality and not easy to volatilize and oxidize.
Abstract: The invention provides a method for producing high-purity nickel boride, and relates to a method for producing nickel boride, in particular to a method for producing the high-purity nickel boride. The method is to mix 25 to 35 weight portions of simple substance boride, 45 to 55 weight portions of metallic nickel and 5 to 60 weight portions of carbon-containing additive, and carry out electrofusion and smelting on the mixture for 4 to 5 hours at a temperature of between 2,000 and 2,400 DEG C through a vacuum electrical resistance furnace to obtain the high-purity nickel boride. The method has the advantages of low cost and environmental protection. The high-purity nickel boride prepared by the method is stable in quality and not easy to volatilize and oxidize.

2 citations


Journal ArticleDOI
TL;DR: The hydrodehalogenation of a series of aryl, alkyl, allyl, and benzyl chlorides, bromides, and iodides has been carried out efficiently using nickel boride in methanol at ambient temperature, leadi...
Abstract: The hydrodehalogenation of a series of aryl, alkyl, allyl, and benzyl chlorides, bromides, and iodides has been carried out efficiently using nickel boride in methanol at ambient temperature, leadi...

Journal ArticleDOI
TL;DR: In this article, a novel synthesis of 2-substituted 3-thioxo-2H-imidazo with nickel boride in dry methanol at ambient temperature is reported.
Abstract: A novel synthesis of 2-substituted 2H-imidazo[1,5-b]isoquinoline-1,5-diones by reductive desulfurization of a variety of 2-substituted 3-thioxo-2H-imidazo[1,5-b]isoquinoline-1,5-diones is reported with nickel boride in dry methanol at ambient temperature.