A method of making chlorins comprises the steps of reacting (e.g. condensing) a dipyrrin western half intermediate with an eastern half intermediate to form a tetrahydrobilene, and then cyclizing the tetrahydrobilene to form a chlorin. Intermediates including tetrahydrobilenes useful in such reactions are also described.
A novel one pot synthesis of α-nitroketones from olefins using trimethylsilylnitrate-chromium trioxide reagent system
作者:M. Venkat Ram Reddy、R. Kumareswaran、Yashwant D. Vankar
DOI:10.1016/0040-4039(95)01421-d
日期:1995.9
A variety of α-nitroketones have been obtained from the corresponding olefins in good yields upon reaction with trimethylsilylnitrate-chromium trioxide reagentsystem.
在与三甲基甲硅烷基硝酸盐-三氧化铬试剂体系反应后,从相应的烯烃以高收率获得了多种α-硝基酮。
Organocatalytic Asymmetric Domino Michael/Acyl Transfer Reaction Between <i>α</i>
-Nitroketones and <i>in situ-</i>
Generated <i>ortho</i>
-Quinone Methides: Route to 2-(1-Arylethyl)phenols
作者:Chandan Gharui、Debasmita Behera、Subhas Chandra Pan
DOI:10.1002/adsc.201801015
日期:2018.12.3
organocatalytic asymmetric domino Michael/acyl transfer reaction between α‐nitroketones and o‐quinone methides is disclosed. o‐Quinone methides are generated in situ from 2‐sulfonylmethylphenols in basic medium. With 10 mol% of bifunctional squaramide catalyst, high yields and excellent enantioselectivities are achieved for a variety of O‐acyl 2‐(1‐arylethyl)phenols under mild reaction condition.
Enantio- & chemo-selective preparation of enantiomerically enriched aliphatic nitro alcohols using Candida parapsilosis ATCC 7330
作者:Sowmyalakshmi Venkataraman、Anju Chadha
DOI:10.1039/c5ra13593a
日期:——
asymmetric reduction of aliphaticnitroketones was carried out in water with ethanol as cosolvent and glucose as cosubstrate using the whole cells of Candida parapsilosis ATCC 7330 in much lesser time (4 h). For the first time, the biocatalytic asymmetric reduction of the following ketones is reported here: 1-nitro-butan-2-one, 1-nitro-pentan-2-one, 3-methyl-1-nitro-butan-2-one and 1-cyclohexyl-2-nitroethanone
A solar cell incorporates a light harvesting array that comprises: (a) a first substrate comprising a first electrode; and (b) a layer of light harvesting rods electrically coupled to the first electrode, each of the light harvesting rods comprising a polymer of Formula I:
1
X
1
⁢
—
(
X
m
+
1
)
m
(
I
)
wherein m is at least 1, and may be from two, three or four to 20 or more; X
1
is a charge separation group (and preferably a porphyrinic macrocycle, which may be one ligand of a double-decker sandwich compound) having an excited-state of energy equal to or lower than that of X
2
; and X
2
through X
m+1
are chromophores (and again are preferably porphyrinic macrocycles).