A Ru carbene (8, Scheme 2) that contains an internal metal-oxygen chelate is an active metathesis catalyst and is readily obtained by the sequential treatment of Cl2Ru(PPh3)(3) with (2-isopropoxyphenyl)-diazomethane and PCy3. This Ru-carbene complex offers excellent stability to air and moisture and can be recycled in high yield by silica gel column chromatography. The structures of this and related complexes have been unambiguously established by NMR and single-crystal X-ray diffraction studies.
Hepatitis C virus inhibitors having the general formula (I)
are disclosed. Compositions comprising the compounds and methods for using the compounds to inhibit HCV are also disclosed.
RESIST COMPOSITION, PATTERNING PROCESS AND POLYMER
申请人:SHIN-ETSU CHEMICAL CO., LTD.
公开号:US20140178820A1
公开(公告)日:2014-06-26
An additive polymer comprising recurring styrene units having an ester group bonded to a CF
3
—C(OR
2
)—R
3
group (wherein R
2
is H, acyl or acid labile group, R
3
is H, CH
3
or CF
3
) such as 1,1,1,3,3,3-hexafluoro-2-propanol is added to a polymer capable of increasing alkali solubility under the action of acid to formulate a resist composition. The resist composition can minimize outgassing from a resist film during the EUV lithography and form a resist film having a hydrophilic surface sufficient to prevent formation of blob defects on the film after development.