I have the answer. Batches 34–37, 39, 40 (plus the unlinked notebook note) all list AIBN catalyst.

Batches using AIBN catalyst (per the structured 9076 records):

• Batch 34 (R-53/07032024) — AIBN 0.2 gm + 0.32 gm
• Batch 34 B
• Batch 34 C
• Batch 35
• Batch 36
• Batch 37
• Batch 37 A
• Batch 39
• Batch 40

Plus one unlinked record, exp-9076-000UNKNOWNNOTEB ("notebook p19, step-1, Phosphate E3+2, Date 2021/1/26"), which also lists AIBN — this is a stub/unlinked notebook entry, not a confirmed numbered batch.

All are synthesis records where AIBN appears as role: "catalyst" in the step-2 material list. Batch 34 is the confirmed one: step 2 lists "iii) AIBN catalyst, 0.2 gm" and "v) AIBN catalyst, 0.32 gm" in toluene at 68-72 °C / N2 [28112025 9076 Expt Table 2025.xls, sheet 9076_Experiments, batch block '34'].

Note: the other document hits (EP 2115023 B1 patent, "9076 Exp 48-60", "LBN 34 -B", "Old ELN SummaryReport") are reference/other-doc text and are not the batch records that matched.