Barbier-type propargylation of carbonyl compounds with propargyl bromide has been achieved with reactive zinc–copper couple under solvent-free conditions. The reaction of aldehydes with propargyl bromide produced the unique homopropargyl alcohols in excellent yields at room temperature without the formation of homoallenyl alcohols. The ketones reacted with propargyl bromide to give the corresponding homopropargyl
Optically active tertiary alcohols by biocatalysis
作者:Devrim Özdemirhan
DOI:10.1080/00397911.2016.1274032
日期:2017.4.3
chemoenzymatic route to optically active aromatic ring-fused cyclic tertiaryalcohols (S)-(–)-1-methyl-1,2,3,4-tetrahydronaphthalen-1-ol-(–)-1b, (S)-(+)-1-methyl-2,3-dihydro-1H-inden-1-ol-(+)-1a has been reported.[9] CAL-A (lipase-A from Candida antarctica) was found the best biocatalyst for 1b, CAL-A cross linked enzyme aggregate (CLEA) for 1a, with ee values of 20 and 45% and the esters 2b and 2a with ee values
quite scarce. We describe an extremely mild and selective method for either the propargylation or allenylation of carbonyl compounds catalyzed by the abundant, safe, and inexpensive metal titanium. These reactions can selectively provide homopropargylic alcohols from aldehydes and ketones or α‐hydroxy‐allenes from aldehydes. The mechanisms involved were also investigated.
SUBSTITUTED 5-(BICYCLO[4.1.0]HEPT-3-EN-2-YL)PENTA-2,4-DIENES AND 5-(BICYCLO[4.1.0]HEPT-3-EN-2-YL)PENT-2-ENE-4-INES AS ACTIVE AGENTS AGAINST ABIOTIC STRESSES IN PLANTS
申请人:Frackenpohl Jens
公开号:US20140051577A1
公开(公告)日:2014-02-20
The invention relates to substituted 5-(bicyclo[4.1.0]hept-3-en-2-yl)penta-2,4-dienes and 5-(bicyclo[4.1.0]hept-3-en-2-yl)pent-2-ene-4-ines of the formula (I) and salts thereof,
where the radicals R1, R2, R3, R4, R5, [X—Y] and Q are each as defined in the description, to processes for preparation thereof and to the use thereof for enhancing stress tolerance in plants with respect to abiotic stress, and/or for increasing plant yield.