biostudies-literatureUnknown15(57)Li NIn the present study, tubular copper silicate microspheres (CuSi-NTMs) were hydrothermally synthesized using high-silicon rice husk ash (RHA) as the raw material. Structural characterization reveals CuSi-NTMs have abundant mesopores, with a larger pore volume (0.367 cm³ g^-1) and specific surface area (375 m² g^-1) than the precursor RHA, facilitating active component dispersion. As expected, CuSi-NTMs exhibited superior catalytic performance in the dearomatization reaction between phenol derivatives and azodicarboxylates compared to other copper-based catalysts, achieving a 98% yield. The steric hindrance and electronic effects of phenolic substituents were also investigated. An ionic catalytic mechanism for CuSi-NTMs has been proposed. Cu(ii) cooRSC advances49557-49564https://www.ebi.ac.uk/biostudies/studies/S-EPMC12700137biostudies-literatureFabrication of copper silicate microspheres using rice husk ash and its application for dearomatization of phenol derivatives.PMC12700137Li HShen QSu LHan XWang HLi NfalseFabrication of copper silicate microspheres using rice husk ash and its application for dearomatization of phenol derivatives.In the present study, tubular copper silicate microspheres (CuSi-NTMs) were hydrothermally synthesized using high-silicon rice husk ash (RHA) as the raw material. Structural characterization reveals CuSi-NTMs have abundant mesopores, with a larger pore volume (0.367 cm³ g^-1) and specific surface area (375 m² g^-1) than the precursor RHA, facilitating active component dispersion. As expected, CuSi-NTMs exhibited superior catalytic performance in the dearomatization reaction between phenol derivatives and azodicarboxylates compared to other copper-based catalysts, achieving a 98% yield. The steric hindrance and electronic effects of phenolic substituents were also investigated. An ionic catalytic mechanism for CuSi-NTMs has been proposed. Cu(ii) coo2025-01-01T00:00:00Z2025 Dec2026-06-06T02:51:29.546Z2026-05-24T03:13:04.831ZS-EPMC127001374139520010.1039/d5ra09185c