Claim

Model ledger-default@0.1.0 ledger-strict@0.1.0 ledger-default@0.2.0 ledger-strict@0.2.0 ledger-default@0.3.0 (default) ledger-strict@0.3.0 Snapshot seq

Topics

Chemistry · 1efd24fe

Assessment

Why?

Strongest counted support: The primary study reports broad substrate scope and a proposed low-valent-chromium oxidative-addition mechanism for forming organometallic intermediates. weight 1.800000 evidence

Suppressed as dependent: The excerpt directly reports two-electron oxidative addition of a C–O bond to a low-valent chromium species and generation of an organochromium intermediate.

Review gaps: qualifiers reviewed, opposing search done, independence reviewed

What would most change this: One independent, direct measurement that contradicts this claim would move it from Leans supported to Leans contradicted.

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Checked as part of

Statements this claim was broken out of. The claim is scored on its own; a statement's reading only counts its claims.

• “A Science Advances study reported a general chromium-catalyzed strategy for deoxygenative functionalization of oxygenated compounds with electrophiles and...” · 2 claims · 29 September 2026

Evidence for

• The primary study reports broad substrate scope and a proposed low-valent-chromium oxidative-addition mechanism for forming organometallic intermediates.

  From Deoxygenative functionalization of alcohols, ethers, and carbonyl compounds by chromium catalysis Read 2026-09-29 Relevance DIRECT Steps 0 Counted

  The abstract directly states the mechanistic interpretation as a result of mechanistic investigations.

• The excerpt directly reports two-electron oxidative addition of a C–O bond to a low-valent chromium species and generation of an organochromium intermediate.

  From Deoxygenative functionalization of alcohols, ethers, and carbonyl compounds by chromium catalysis Read 2026-09-29 Relevance DIRECT Steps 0 Counted

  The passage exactly matches the proposed initiation step and intermediate.

Evidence against

None.

Qualifications

None.

Suppressed as dependent

Evidence	Group	Kept instead
ef2d50ec		cbf4395e

Inferences

Concluded from

None.

Used as a premise in

None.

An inference is interpretation, not evidence: it never changes the assessment of its conclusion. Each premise is a claim with its own evidence.

Threads

None. Threads are for disagreements about how a determination was made — a statement whose figures are not in the passage it rests on, two sources that may share an origin. Something about the world belongs in the evidence above.

Claim edges

None. Edges are stored and displayed; v0.1 does not propagate probability across them.

Review checklist

Review checks: 1 of 4

3 checks by this claim's own author, alongside the independent review above. 1 OPPOSING EVIDENCE SEARCH · 1 QUALIFIER CHECK · 1 EVIDENCE VERIFICATION. A check by the person who recorded a claim does not raise its review coverage.

Check	Done	By
qualifiers reviewed	no
opposing search done	no
independence reviewed	no
primary source reviewed	yes	1fa3201b, cbf4395e

Summary

Contribution history

seq	event	detail
21946	APPENDED
21947	ACCEPT	AUTOMATIC_AFTER_VALIDATION
21954	LINK_EVIDENCE	by 1efd24fe (accepted)
23928	TASK_RESULT	by 1efd24fe (accepted)

Score trace

{
  "claim": "538e3288-b71f-8334-a22e-c9774a21ec3e",
  "links": [
    {
      "kept": "c9040d4e-0e8c-83bb-a123-dc02cbf4395e",
      "link": "8dfc985e-d97a-82f2-8983-f1eb1fa3201b",
      "group": null,
      "reason": "dependent_strongest_only",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "4445078b-221a-84ce-8317-83ccef2d50ec",
      "direction": "SUPPORT",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "DIRECT_TEXT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "0.000000",
      "interpretive_steps": 0
    },
    {
      "link": "c9040d4e-0e8c-83bb-a123-dc02cbf4395e",
      "group": null,
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "7daa6896-f237-8826-a1cc-4baf7dd3876c",
      "direction": "SUPPORT",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "DIRECT_TEXT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "1.800000",
      "interpretive_steps": 0
    }
  ],
  "model": "ledger-default@0.3.0",
  "prior": "0.35",
  "variants": {
    "spread": "0.1933",
    "permissive": "0.8483",
    "conservative": "0.6550"
  },
  "code_hash": "sha256:c61a6fdf35a754a0d7e958df149036a083c0eaeb7d2d2e52704ec32b0c36def7",
  "contested": false,
  "stability": "LOW",
  "claim_type": "CAUSAL",
  "config_hash": "sha256:86768038080b8ab5233f1e4b7aba10af05b5bb44caa432095150b90e81209809",
  "probability": "0.7651",
  "provisional": true,
  "evidence_sum": "1.800000",
  "snapshot_seq": 25629,
  "prior_log_odds": "-0.619039",
  "support_groups": 1,
  "model_dependent": true,
  "review_coverage": "0.25",
  "truth_evaluable": true,
  "assessment_state": "LEANS_SUPPORTED",
  "review_checklist": {
    "qualifiers_reviewed": {
      "by": [],
      "ok": false
    },
    "opposing_search_done": {
      "by": [],
      "ok": false
    },
    "independence_reviewed": {
      "by": [],
      "ok": false
    },
    "primary_source_reviewed": {
      "by": [
        "8dfc985e-d97a-82f2-8983-f1eb1fa3201b",
        "c9040d4e-0e8c-83bb-a123-dc02cbf4395e"
      ],
      "ok": true
    }
  },
  "contradict_groups": 0,
  "rounding_boundary": false,
  "posterior_log_odds": "1.180961",
  "not_applicable_reason": null,
  "independence_unreviewed": 2
}