Preservation of the Conformational Structures of Single-Polymer Crystals in Solution was written by Itoh, Takahito;Suzuki, Tatsuya;Kondo, Fumiaki;Suzuki, Takumi;Uno, Takahiro;Kubo, Masataka;Tohnai, Norimitsu;Sanda, Fumio;Miyata, Mikiji. And the article was included in Macromolecules (Washington, DC, United States) in 2022.Computed Properties of C11H20O4 This article mentions the following:
We have found that the cis-conformational structures in single-polymer crystals obtained by solid-state polymerization are retained in solution A soluble alternating copolymer was accidentally obtained during our research employing a series of 7,7,8,8-tetrakis(alkoxycarbonyl)-p-quinodimethanes (1) with alkoxy groups such as methoxy(1a(Me)), ethoxy(1b(Et)), propoxy(1c(Pr)), isopropoxy(1d(iPr)), butoxy(1e(Bu)), isobutoxy(1f(iBu)), pentyloxy(1g(Pen)), hexyloxy(1h(Hex)), and dodecyloxy(1i(Dod)). Thus, 1a(Me), 1b(Et), 1c(Pr), 1e(Bu), and 1g(Pen) with linear alkoxy groups afforded 1:1 charge-transfer complex crystals with 7,7,8,8-tetracyanoquinodimethane (3), while 1d(iPr), 1f(iBu), 1h(Hex), and 1i(Dod) with branching or linear long-chain alkoxy groups did not. The former crystals topochem. underwent photochem. and thermal copolymerizations via a radical mechanism to yield cis-conformational alternating copolymer crystals according to X-ray crystallog. Attractively, the rates of thermal copolymerization were found to increase roughly with an increase in the chain length of the linear alkoxy groups and/or a decrease in the reacting exomethylene carbon distances between 1 and 3. This finding led us to carry out a spontaneous copolymerization of 1g(Pen) with 3 in solution, resulting in the first synthesis of a soluble alternating copolymer during our research. Spectral analyses of the soluble copolymer of 1g(Pen) with 3, together with geometry optimization and spectroscopic simulations, proved that the cis-conformational structure was retained in solution as well as in the solid state. This provides the first spectral observation of a cis-conformational structure in solution with respect to the alternating copolymers of the p-quinodimethane derivatives In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Computed Properties of C11H20O4).
malonic acid dibutyl ester (cas: 1190-39-2) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.Computed Properties of C11H20O4
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics