US 7,531,619 B2
Process for producing dendrimer, building block compound, and process for producing thiophene compound
Satoru Obara, c/o Photosensitive Materials Research Center, Toyo Gosei Co., Ltd., 2-1, Wakahagi 4-chome, Inbu-mura, Inba-gun 270-1609 (Japan); and Kentaro Tada, c/o Photosensitive Materials Research Center, Toyo Gosei Co., Ltd., 2-1, Wakahagi 4-chome, Inba-mura, Inba-gun 270-1609 (Japan)
Appl. No. 10/521,689
PCT Filed Jul. 14, 2003, PCT No. PCT/JP03/08900
§ 371(c)(1), (2), (4) Date Jul. 21, 2005,
PCT Pub. No. WO2004/009669, PCT Pub. Date Jan. 29, 2004.
Claims priority of application No. 2002-210221 (JP), filed on Jul. 18, 2002.
Prior Publication US 2006/0122364 A1, Jun. 08, 2006
Int. Cl. C08G 75/06 (2006.01); C08G 75/00 (2006.01); C08G 61/00 (2006.01); C08G 61/12 (2006.01)
U.S. Cl. 528—377  [528/378; 549/4; 549/59] 3 Claims
 
1. A method for producing a dendrimer having a structural repeating unit which is represented by formula (1) and which contains a linear portion including a thienylene moiety and a branch portion Y formed of an optionally substituted trivalent organic group, the method being based on the convergent method, characterized in that the method comprises reaction step 1 of converting α-position hydrogen of the thiophene ring of a thienylene-moiety-containing compound (a) for forming end moieties to an active group V1 which undergoes Suzuki cross-coupling reaction, to thereby form compound (b); reaction step 2 of subjecting a compound (c) to Suzuki cross-coupling reaction with the compound (b) to thereby yield compound (d), the compound (c) having a linear portion and a branch portion Y and having, at the branch portion Y, two active groups V2 which undergo Suzuki cross-coupling reaction with the active group V1 reaction step 3 of converting α-position hydrogen of the thiophene ring of the thus-formed compound to an active group V1 which undergoes Suzuki cross-coupling reaction, and reacting the compound (c) with the active group V2, to thereby form a dendron of a subsequent generation; and a step of repeating the reaction step 3 in accordance with needs, to thereby form a dendrimer:

OG Complex Work Unit Drawing
(wherein Z represents a single bond or an optionally substituted divalent organic group having no active group; each of R1 and R2 is selected from among a hydrogen atom, an alkyl group, and an alkoxy group; Y represents an optionally substituted trivalent organic group; Y1 is identical to Y or represents an organic group having a skeleton identical to that of Y; W may be absent or represents an optionally substituted monovalent organic group having no active group; m is an integer of 0 or more; and each of V1 and V2 serving as active groups is selected from active groups which undergo Suzuki cross-coupling reaction, V1 and V2 being able to be mutually cross-coupled, and wherein V1 is —B(OH)2 and V2 is —Br).