- Amination of aliphatic alcohols with urea catalyzed by ruthenium complexes: effect of supporting ligands
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In the present study, ruthenium-catalyzed amination of alcohols by urea as a convenient ammonia carrier in the presence of free diphosphine ligands has been described. A number of ruthenium-phosphine complexes have been studied among which, [(Cp)RuCl(dppe)] was found as an efficient catalyst for alcohol amination reaction. The crystal structures of two new half-sandwich ruthenium complexes, [(Cp)RuCl(dppe)] and [(C6H6)RuCl2(PHEt2)], were determined by X-ray crystallographic analysis. Also the effect of using different supporting phosphines, ratio of raw materials and reaction temperature on conversion and selectivity was investigated. Under optimum reaction conditions high conversion (98percent) and chemo-selectivity toward secondary amines were obtained.
- Dindar, Sara,Nemati Kharat, Ali
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- Utilization of common ligands for the ruthenium-catalyzed amination of alcohols
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Simultaneous presence of bidentate phosphines with surprisingly simple structure and of the ligand triphenylphosphine were revealed as structural characteristics of new Ru catalysts for the selective conversion of primary and secondary alcohols and diols into their corresponding primary amines and diamines (see scheme). Copyright
- Baumann, Wolfgang,Spannenberg, Anke,Pfeffer, Jan,Haas, Thomas,Koeckritz, Angela,Martin, Andreas,Deutsch, Jens
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supporting information
p. 17702 - 17706
(2014/01/17)
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- Synthetic communications reviews: Synthesis of primary amines by one-pot reductive amination of aldehydes
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We report here a novel, one-pot, two-step reductive amination of aldehydes for the atom-economical synthesis of primary amines. The amination step has been carried out with hydroxylammonium chloride and does not require the use of a base. In the subsequent reduction step, a metal zinc/hydrochloride acid system has been used. This method is applicable to both aliphatic and aromatic aldehydes. The operational simplicity, the short reaction times, and the mild reaction conditions add to the value of this method as a practical alternative to the reductive amination of aldehydes. Copyright
- Ayedi, Mohamed Ali,Le Bigot, Yves,Ammar, Houcine,Abid, Souhir,Gharbi, Rachid El,Delmas, Michel
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p. 2127 - 2133
(2013/07/25)
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- Synthesis of primary amines from secondary and tertiary amines: Ruthenium-catalyzed amination using ammonia
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Splitting of secondary and tertiary amines! The first selective catalytic synthesis of primary amines from secondary and tertiary amines with ammonia is reported. The products are obtained in yields up to 84 %. Copyright
- Baehn, Sebastian,Imm, Sebastian,Neubert, Lorenz,Zhang, Min,Neumann, Helfried,Beller, Matthias
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experimental part
p. 4705 - 4708
(2011/05/12)
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- Combinations of sunscreens
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Combinations of sunscreens comprising at least one specific anti uv-B filter with triazinoaniline structure and at least one specific anti UV-A filter selected from filters with benzoxazol substituted triazinoaniline structure and a long chain alkyl ester of a benzoxazolyl-aminophenyl-cyanoacrylic acid. Cosmetic and dermatological compositions containing them, optionally in combination with vitamins and/or other anti UV-A and anti UV-B filters.
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- 2-aminopyridine derivatives and combinatorial libraries thereof
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The present invention relates to novel 2-aminopyridine derivative compounds of the following formula: wherein R1to R5have the meanings provided herein. The invention further relates to combinatorial libraries containing two or more such compounds, as well as methods of preparing 2-aminopyridine derivative compounds.
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- A new novel and practical one pot methodology for conversion of alcohols to amines
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A convenient and efficient one pot sequence has been developed for the transformation of alcohols to amines using sodium azide, triphenylphosphine in CCl4-DMF.
- Vidya Sagar Reddy,Venkat Rao,Subramanyam,Iyengar
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p. 2233 - 2237
(2007/10/03)
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- Combinations of sunscreen agents with UV-A and UV-B filtering properties
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Combinations of sunscreens comprising at least one specific anti UV-B filter with triazinoaniline structure and at least one specific anti UV-A filter selected from filters with benzoxazol substituted triazinoaniline structure and a long chain alkyl ester of a benzoxazolyl-aminophenyl-cyanoacrylic acid. Cosmetic and dermatological compositions containing them, optionally in combination with vitamins and/or other anti UV-A and anti UV-B filters.
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- Preparation of amines
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A process for preparing an amine by catalytic reaction of an olefin with ammonia or a primary or secondary amine by contacting a mixture of the reactants in a reactor at 200° to 400° C. and an elevated pressure up to 700 bar in the presence of a catalyst consisting essentially of an X-ray amorphous (non-crystalline) mesoporous catalyst, some of which may have a microporous non-crystalline content. The catalyst has the composition where Q is at least one of the trivalent elements aluminum, boron, chromium, iron or gallium, and M is at least one of the tetravalent elements silicon, titanium or germanium. The molar ratio of a:b is from 0.5:1 to 1000:1 and the molar ratio of c:b is from 0 to 2:1. As prepared and used in the process, this non-crystalline catalyst has a specific BET surface area of from 200 to 1000 m2 /g.
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- Poly-bis-triazinylimides, their preparation
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Poly-bis-triazinylimides of the formula STR1 are prepared from bis-(2,4-dichloro-1,3,5-triazin-6-yl)imides and polyalkylpiperidylamines. They are used as light stabilizers for polymers.
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- Quaternary alkynoxymethyl amines
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This invention relates to quaternaries of alkynoxymethyl amines and uses thereof. These may be summarized by the following formulae: STR1 where R and R' are substituted groups such as alkyl, aryl, etc.; R'" is an acetylenic group; and X is an anion; and STR2 where R and R'" having the same meaning as in (1) and Z is a bridging group, preferably hydrocarbon such as alkylene, alkinylene, alkenylene, arylene, etc.
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- Microbiocidal quaternaries of halogen derivatives of alkynoxymethyl amines
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This invention relates to quaternaries of halogen derivatives of alkynoxymethyl amines and uses thereof. These may be summarized by the following formulae: STR1 where R and R' are substituted groups such as alkyl, aryl, etc.; R" is an alkylidene group; and X is halogen and A is an anion; and STR2 where R, R' and R" having the same meaning as in (1) and Z is a bridging group, preferably hydrocarbon such as alkylene, alkinylene, alkenylene, arylene, etc.
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- Alkynoxymethyl amines
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This invention relates to alkynoxymethyl amines, to methods of preparing them, and uses thereof, particularly as corrosion inhibitors. These compounds are prepared by reacting an amine, such as RNH2, with an aldehyde, such as formaldehyde, and an alkynol, such as propargyl alcohol, to yield compounds of the formula where R is a substituted group, preferably alkyl, cycloalkyl, aryl, etc., and R' is an acetylenic alcohol moiety.
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