Zur Kenntnis des H�rtungsprozesses von Phenol-Formaldehyd-Harzen

Ditopic Receptors based on Lower‐ and Upper‐Rim Substituted Hexahomotrioxacalix[3]arenes: Cation‐Controlled Hydrogen Bonding of Anion

“…The preparation of cone ‐7,15,23‐triethoxycarbonyl‐25,26,27‐tris( N,N ‐diethylaminocarbonylmethoxy)‐2,4,10,12,18,20‐hexahomo‐3,11,19‐trioxacalix[3]arene ( cone ‐ 4 ) is shown in Scheme . Thus, bis(hydroxymethylation) of ethyl‐4‐hydroxybenzoate ( 1 ) with formaldehyde in aqueous NaOH for one week afforded ethyl‐3,5‐bis(hydroxymethyl)‐4‐hydroxybenzoate ( 2 )15 in 41 % yield. Heating compound 2 to reflux in p ‐xylene for 24 hours afforded hexahomotrioxacalix[3]arene 3 11a.…”

A Novel [60]Fullerene-Calixarene Conjugate Which Facilitates Self-Inclusion of the [60]Fullerene Moiety into the Homooxacalix[3]arene Cavity

“…The initial calculation was carried out in vacuo by molecular dynamics (MD) minimization around 500 K, followed by molecular mechanics (MM). The syntheses of compounds 2, [18] 3, [19] 6 [20] and 7 [21] were described previously. In the elemental analyses, even though the samples were dried at room temperature under vacuum for a few days, the solvent molecules could not be removed (as frequently seen for solid calixarenes).…”

Synthesis and inclusion behavior of a heterotritopic receptor based on hexahomotrioxacalix[3]arene

“…The preparation of cone -7,15,23-triethoxycarbonyl-25,26,27-tris-(N,N-diethylaminocarbonylmethoxy)-2,4,10,12,18,20-hexahomo-3,11,19-trioxacalix [3]arene (cone-4) is shown in Scheme 1. Thus, bis(hydroxymethylation) of ethyl 4-hydroxybenzoate (1) with formaldehyde in aqueous NaOH for one week afforded ethyl 3,5bis(hydroxymethyl)-4-hydroxybenzoate (2) 16 in 41 % yield. Heating c o mp ound ( 2) to r e fl u x in p -xyl e n e fo r 24 h a ffo rde d hexahomotrioxacalix [3]arene (3).…”