Electrophilic Substitution in 5,6-Bis(dimethylamino)acenaphthylene as a Route to Push-Pull Proton Sponges

• Autorzy: Mekh M. A. , Pozharskii A. F. , Ozeryanskii V. A.
• Języki publikacji: EN

Abstrakty

EN

Unlike 1,8-bis(dimethylamino)naphthalene (pro ton sponge), 5,6-bis(dimethyl - amino)acenaphthylene 2 has been shown to undergo H/D-ex change in CF3CO2D at 65°C. Both hydrogen atoms at the C1=C2 double bond and inpositions 3(8) and 4(7) of the naphthalene fragment are reactive in the ratio 3:1.3:1, respectively. Arylsulfonation and nitration of 2 with tetranitromethane provide direct substitution at C(1) with the formation of push-pull derivatives in moderate yield. Isomeric 3-ni tro- and 4-ni tro- 5,6-bis(dimethylamino)acenaphthylenes can be synthesized via dehydrogenation of their more accessible acenaphthene precursors. The Vilsmeier formylation of 2 affords along with 1-formyl- and 1,2-diformyl derivatives some amount of 1,7-dialdehyde that reflects a comparable reactivity of ethylene and naphthalene moieties in the non-protonated substrate. The green ish-yel low proton salt of deep violet 5,6-bis(dimethyl amino)acena -phthylene-1,2-dicarbaldehyde has been found to exhibit strong positive solvatochromism caused by partial deprotonation.

Słowa kluczowe

EN

acenaphthylene; proton sponge; electrophilic substitution; push-pull systems; solvatochromism

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2009
• Tom: Vol. 83, nr 9
• Strony: 1609--1621
• Opis fizyczny: Bibliogr. 25 poz., rys.

Twórcy

autor

Mekh M. A.

autor

Pozharskii A. F.

autor

Ozeryanskii V. A.

• Department of Organic Chemistry, Southern Federal University, Zorge 7, 344090 Rostov-on-Don, Russian Federation,

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